Malicious PDF — malware analysis report

Static analysis result for SHA-256 4610129cc9555654…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 02:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e9096ee345f6cc1536010f4387336d6 SHA-1: ce7d9d8c9ba5f0d75b35231467fae1bbcbd2d697 SHA-256: 4610129cc9555654379eaa603ecb0c66dfa1773149f6f9adb3ee361386496c2c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to various domains, including one hosted on a compromised WordPress site, suggesting a phishing or malware distribution scheme. The PDF's structure and numerous external links are indicative of an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=convert+iso+to+wbfs+wii PDF link annotation
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4ed5390a3---33177547286.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/wozomiwelarew.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/24538783400.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/1336f3bb124591e97bbff5ac8e17d4d4/widaguvaxipi.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/847610250.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/55830034531.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210907024827.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/doxiwafojimomizikugajajeg.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/zuxixusotaderumexevime.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c52257551b62815e0a4a72806fcee46c/82750250283.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/69584079240.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109150518595557.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/16446225106.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/12351677104.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301048d1f22---94660221094.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/41018086441.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/zedojazijarepanetokole.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/madoxolaluvuduludapi.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/12733227.pdfIn PDF document text
    • http://planetamama.ru/files/file/49046506009.pdfIn PDF document text
    • http://azizolace.cz/images/file/mavixipatumekivurex.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/watixevuguxajonedebiki.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/govewafurit.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/6582967839.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_off0000cedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 17724 bytes
SHA-256: b591cac3790bee3eba86f4c4705d4ea0f8e1ac522fac2863b103e83fc66e73bf
font_02_sfnt_off000114fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 10324 bytes
SHA-256: 2d38564002e74815bb230368ee64bc7b1c0aa0e1b8734e6ada9a7b32fa8cb767

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