Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a672659309a8c0e…

MALICIOUS

PDF

91.0 KB Created: 2021-10-20 20:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ace6161e4024588fdf21f06e0c89747a SHA-1: 8d12bad5c59407e574e23ef4133c83dcce0200b5 SHA-256: 7a672659309a8c0eb22d7a2da2ddd1365c146d5f5f88f82f53ccc19a48a2a967
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress upload storage and utilize SEO poisoning techniques to attract victims. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • 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.
  • 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://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16169ed2383f62---limerisebasijok.pdf In PDF document text
    • http://zhizhencn.com/filespath/files/20210908165839.pdfIn PDF document text
    • http://itena.si/uporabnik/file/menomo.pdfIn PDF document text
    • http://tavio.su/files/file/58267024339.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/vepolikufuriwuwebegutikuv.pdfIn PDF document text
    • http://m2m2design.com/userfiles/8700721566.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210927_054556_153.pdfIn PDF document text
    • https://halkum.rs/files/20166362680.pdfIn PDF document text
    • http://blccy.com/userfiles/files/fabiguvobe.pdfIn PDF document text
    • https://33mobility.net/uploads/files/42788870790.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161347355b253d---wobinuv.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ru9kqjrjndbpm3johqbe1skviv/36615875579.pdfIn PDF document text
    • http://xn--80aer5aza.xn--80aai5amepo3c7b7a.xn--p1ai/ckfinder/userfiles/files/besodisosakes.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/janemazizomab.pdfIn PDF document text
    • http://pasat.alehotel.pl/userfiles/file/tarojigafodi.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/80834357567.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/vopomivabe.pdfIn PDF document text
    • https://togeltop.net/contents/files/88906246226.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/zagumenigaginewos.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1616a04800984b---tomarero.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/movomowuxetodizoruj.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/rinagefigalabowaxemozotes.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16165dc61174e9---keverularavep.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/88192179700.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/sokijarokugumifeb.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021101014340153.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TSvcnjQ06Jg/uplcv?utm_term=prokat+boats+for+sale+by+ownerPDF 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_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 10548 bytes
SHA-256: b568b225acb504dbdd84f71711c7d2bf6c2f2595b7425bfd4a7de20ff532c7fe
font_01_sfnt_off000114e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF2 18880 bytes
SHA-256: 8c35fe943ebdedad97c48d2564435ccd25eacc0da3d6c2a1f74c308c5a42e646

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