Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62e291bcd9c3018…

MALICIOUS

PDF

90.9 KB Created: 2021-09-03 18:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d48e4a52030ec0a265610a449a4921df SHA-1: 5fbfc005ddcce10bc29e7f13ffb9f3c822a0edb7 SHA-256: d62e291bcd9c3018c9600b018ec782478e70becfd49c4191888903e6e9b8301d
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm or SEO spamming operation. The presence of ClamAV and ML detections for phishing and malware further supports its malicious nature. The document body is heavily obfuscated, preventing a clear understanding of specific user interaction, but the overall structure and heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 7

  • 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.
  • 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://archism.ru/uplcv?utm_term=manualidades+para+navidad+faciles+con+material+reciclado PDF link annotation
    • https://sakkestadbil.no/userfiles/file/pixenebudatuji.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/91286483326.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/muzamimiranoduzagotapo.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/63307209727.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/pokijutupej.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/19252946486.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db0865e438---40627910553.pdfIn PDF document text
    • http://alltechsro.cz/files/futuzigajurafowoda.pdfIn PDF document text
    • http://naucseto.cz/storage/52500740938.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/1cf3b3b3e43e7ce786a03725e8941ac8/29826336076.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/gufogipomorivuxetunirit.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b1df0af5ea---30904611241.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/57052958007.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/22658214871.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/remixovojikub.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/2dbe829bfb4b81ea289da595df7b4758/22950997846.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/psrto2segpthdu31edhmrfl4a4/kolevapolaboxap.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88783035638.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/4fcf9c0952e295681b1a72c513706c10/33166016289.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8650109f8---wuroxevanakogu.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa7fd97ed8---15340146160.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/poluzogubawexedakol.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1629060984.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/85118803292.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/29306966038.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/76377637539.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/76b208aa4db91550441759a8c1a7fea8/41340461204.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_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11320 19188 bytes
SHA-256: 67b05efa3015ff0e25e47db66c3a8fc2c6480271149f8199097613fd7abd82d4
font_02_sfnt_off000143d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D8 10940 bytes
SHA-256: 35c225b98d9e22e4f8ab570779d9be68c1f9ee2216dca75854624d58051e632a

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