Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca97de6bc5f531c7…

MALICIOUS

PDF

77.6 KB Created: 2021-08-27 06:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0b37e5f988a4b784b740618d44cf3f9 SHA-1: de4e31bd9216d30e1390f6489f4104c67cea801d SHA-256: ca97de6bc5f531c7027f2444152a0427241a3b7bd547f827f6ab4d337c209c46
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classification and ClamAV, and exhibits characteristics of a callback phishing lure. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The document body is heavily obfuscated and unreadable, but the presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a sophisticated effort to host and link to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • 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://cructi.ru/uplcv?utm_term=800+country+code PDF link annotation
    • http://stolizstekla.ru/userfiles/file/vinexo.pdfIn PDF document text
    • https://dm288.com/slicice/file/16756515711.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/pufosorufopigomabaz.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/21748166106.pdfIn PDF document text
    • http://aqcons.vn/upload/files/vozomezuxopekumaxobum.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad9f102f50---zixefiz.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/powomufapefunefeziven.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/bq9vfi1b3ukg0btitkq8ktuhc5/wuxolebagobujupelad.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ca287eb9f64cd035a7726f9a05d292e0/kibasuxujakuki.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/witewofegetugetotas.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/75cbf4af073fbd70674d45be2526ce36/wuwibenafuv.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/20133790586.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/ninovazes.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/48370868286.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/71145774051.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/55275092326.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/40100281981.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/63qadubiihj38i4bk06l5jp8mg/zazupifuwugegaritunozej.pdfIn PDF document text
    • http://budka39.ru/files/20294685249.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/74744321518.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/72705494931.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/vesuk.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/8bd6c6e15b1c2b941ea0451410757afe/45185606354.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/12646120689.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610969302c3de---3100595108.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/qhiqse8p0dasb15tmatrageuh6/falijezemekebojabis.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_off0000ceda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDA 16116 bytes
SHA-256: ade9e6e2faf339f1b37f029b56416973cfad3ffc7a63cb56bf709fbe430d33f5
font_01_sfnt_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D5 10340 bytes
SHA-256: a520bcab97d0b36f655ad5081ad8386110ce0c170ed7d7c0a9fdfc2a723ed484

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