Malicious PDF — malware analysis report

Static analysis result for SHA-256 9442b713cdce503c…

MALICIOUS

PDF

115.8 KB Created: 2021-07-19 19:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24605f86f5b83463f537ee9f99bc8a33 SHA-1: df15d8d9828fc7bf8c8a65ee6e152a0fd1f5b8a6 SHA-256: 9442b713cdce503c6e03763bf3b3ada42a5b735e3fe373ed0e738c6430e7cb5e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or scam attempt. The embedded JavaScript and numerous links to compromised CMS upload storage and disposable hosting suggest an attempt to deliver a malicious payload or redirect users to a phishing site. The heuristic 'SE_CALLBACK_LURE' specifically indicates the document likely prompts the user to call a phone number, a common tactic in callback phishing and tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://automsystem.com/UploadFile/file/20210504221443954.pdf In PDF document text
    • http://dok-vo.ru/userfiles/file/82340579242.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/rofawexefokonigi.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/55510104514.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/tafarulevibemukagimagiv.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/zuzog.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/cemclvtlsct5fa1jr51a8128i4/96195598482.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7164484e5---21831298741.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/95114970024.pdfIn PDF document text
    • http://grupophi.es/uploads/files/88078716840.pdfIn PDF document text
    • http://esistore.de/userfiles/file/92564427707.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/jolino.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/57037216797.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c20c3325c---95628982626.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077016824852---xojopuxivejosotexolob.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8caca4f1b3---95265208308.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/0t36630g77hr4ccdlhn19pq116/jinemi.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/26911179153.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840583caee2---xuwajuxa.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/55361248199.pdfIn PDF document text
    • https://bloomeng.com/uploads/xesosexozud.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/suvedof.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/4466098015.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/20174091449.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/womevupe.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/4602a10c257c7f04d8e16677d2933fbb/zugalelisirozilerapuneni.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/4de5c907c2fccef699cee8d1df272331/basikinumurimodij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=timnath+co+to+fort+collins+coPDF link annotation
    • 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_off000164ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164AB 10432 bytes
SHA-256: c94efb2d6f497e3b5c43f067200d2d75f230c873a530058ed202714f2af5a20c
font_01_sfnt_off00017c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C13 17236 bytes
SHA-256: dbe8dbffdfb40b142c74c3e40e8badb0ff21430aff05456092016f731dfe05ba
font_02_sfnt_off0001a94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A94B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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