Malicious PDF — malware analysis report

Static analysis result for SHA-256 033578f5effabb6e…

MALICIOUS

PDF

87.4 KB Created: 2021-07-06 14:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8229f52d5f5fd7700abc7a0266c94e37 SHA-1: 30ae4f4a1111784e78091e0401d33fbaef30998a SHA-256: 033578f5effabb6e28aad06dda776e74855098938b86bb2405dd28f475117f3e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites and link farms. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam pretext. The embedded JavaScript likely facilitates the redirection to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=tutorial+cheat+engine+android PDF link annotation
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/70046143049.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/2cagiqeevt6se4bkud1j3ih5fv/zururironilutizowerig.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cec977162---29371916627.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/ramug.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7c230d14d4cc110356735e620c532390/forufifagimilelozekewup.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a5bcc1975---56787642965.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/jkpqthv6eg23t42014rjmsoiqt/27057760628.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/64ae0acb6b57aa085ed93aa01c3714d6/karirilu.pdfIn PDF document text
    • http://techbis.pl/files/file/80665602951.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/51d198a6c3abb58ce2eebface234d00b/xagexude.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/liwolapesawimebewadet.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/151471786dd3171b33e6618773eaba6e/8413783937.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/fdf89990f64a672b6c5c61f2f5611a01/75709284154.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71b51355c5---bezetivufow.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608255004bd0d---kifumibitujukasulebus.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160822d00918b8---kolipobu.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/82399900344.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kajunisenoporemivaxoba.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/26fac9cd66deff329d2b7a3c27269ee9/7745583778.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e64344a07---48038328608.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/guvawobajimeki.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/2d67bc378cc1cb03919fa0e07cc0b11d/35529533242.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/de5e6a13048cbd86d22d334a4b5adc5d/fikugosivaf.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/97365239500.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/33a4c1c42461397aacb81433194db169/31740764340.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 18244 bytes
SHA-256: b85f3e2f2ba87ba7e0f832fc921a8e19efd5ca96ada642df7ec2ee75da799825
font_02_sfnt_off00013711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13711 10544 bytes
SHA-256: 46509b8093a04bccceaa495a8818fdf9e9594c812a3dbfdba64d585039732838

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