Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e2c3e8c8b9fac7…

MALICIOUS

PDF

86.1 KB Created: 2021-08-26 13:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 196ed26fc8f01945789997e783d81495 SHA-1: 6dd49006a0261327e8407ffd65d5c0aa79720ed7 SHA-256: 31e2c3e8c8b9fac7f9103bf612b7be5f7f239ee20bb4309e4c00c368fd9556b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious PDF designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=the+piccaninny+grampians PDF link annotation
    • http://violetstudio.in/userfiles/file/bunowivopaduz.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ec59b4fc9---kelewatikamuvapimum.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc69de9350---mubenapuwivijifujevob.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/fozataxed.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/79187744737.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b33ed34dd42---33568538384.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5f26f3e90---29508683255.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fb652d420---70098735707.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/jizesamusakoguxadi.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/tmgo3skcbndpih7vi1cvi3prpv/88847636085.pdfIn PDF document text
    • http://benetalent.com/upload/files/wenabuluwizenavufamegiz.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/sadavuvidapex.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/45418389631.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/15133618970.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/92c597d43dfbe920cadf64935175954b/lifix.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606c960545002---makanonofuten.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/namarub.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/vi4lofhipghoamfened357v6k1/jesezafepufidebaliwix.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/74559805519.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/zinoluwepozexig.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17npvd9lkjqo63m9ifn7ms9a64/56983157335.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/jeguvojudeje.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16091f91674091---46613287346.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/52304681360.pdfIn PDF document text
    • http://skncn.com/u/files/zurudufodidematuvor.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_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 16932 bytes
SHA-256: 6cda33d053de23b59707c19e55aa7aaacc1287492ae741355421759603c9efb0
font_02_sfnt_off00012fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC5 10632 bytes
SHA-256: a909757126471f63d628378d8d04ae08cc91827abc349b9b5140bb467a0b0de0

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