Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c794bfc4332565…

MALICIOUS

PDF

96.3 KB Created: 2021-09-07 06:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e8ce1b9bf143449d3718d55d319c270 SHA-1: 8ac4a55b6a60d8e22d0d2f1f76681372194734fb SHA-256: c7c794bfc4332565a67aa6763b2e6eba135fcf5dc680155f15edceb2d5ef0775
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded JavaScript and the presence of numerous URLs, many hosted on compromised or disposable domains, suggest an attempt to redirect users to malicious content or phishing sites. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a phone number intended to trick the user into calling, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://mebelhotel.ru/userfiles/files/bopipebuvu.pdf In PDF document text
    • http://akvari-um.ru/userfiles/file/98759616607.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607429ee7ec57---beruve.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/44644362427.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/cdc71ae1b6dc34b6993c48e1e21ff928/96141081401.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/xomeletawujosusirele.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/56533227070.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/jovinasezipamavugegumam.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/91165520996.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/jigubagazebug.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210902122521_pwhvbe.pdfIn PDF document text
    • http://halaljones.com/uploads/files/92546925176.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/95098624690.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/difajanevekekiri.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/tubopigonobewigonedipufi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d85c0b8f6bb---74626990148.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800a7e42d74---gekabuvigukoj.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcb4b214e1---54746905840.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828729e301a---jekerejo.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/lamufozozid.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/6632644999.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c1efba5d6---rilojiwagukapiso.pdfIn PDF document text
    • http://freewest.at/niguzawugetojeb.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/8l2hc3fjvi4u8ir8jm1eqtn24j/11682335533.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///lopijikixuxakano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mobile+money+in+uganda+pdfPDF 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_off00011327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11327 18644 bytes
SHA-256: fe0a28a9ed81dc00c3b627a340577f679d29f0b39137e168867595da1544e7a3
font_01_sfnt_off00014335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B4C 10820 bytes
SHA-256: b0f6fc7431f7bdc8c366e1e2d17461920807a0b35e9d19d547adae62b4a656a0

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