Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0d033a17278967…

MALICIOUS

PDF

86.2 KB Created: 2021-07-26 04:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 67a168a1c48cc0d9d84ddafa368e7626 SHA-1: a10f6d5a1122cbdfaf80bc275b61443140a05b9f SHA-256: ef0d033a17278967eb4a031a276f2604c3b72786e77cf8b97e2b69e894c09a5c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO spam. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://mishelik.ru/userfiles/file/todamipewowekipukirezeme.pdf In PDF document text
    • https://geniodelweb.com/file/zumedativogamarakowa.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/194607d80e8d1255162ae0d5397588d9/nojevovunuliki.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/70888251874.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/suvunazusoluxatugogozarip.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffb961b365---wabufak.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/76629266323.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/65731976835.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c870f85cff7c1b7ee5ab60b2bd72df1e/zanuwifofisudeza.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/22d405994b0120cdb9ba2467b2f765d6/xinadosowisopukukixixigag.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da69abbaa08---41812071517.pdfIn PDF document text
    • http://poorclarescork.ie/images/49852936443.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807baf63ca4---velinofoferewivob.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210517214728.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75733a13e2---21914299406.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/h1u2bmt0iqov42f21a4pl33kll/sedex.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b364c36033---mabogibidelaloxagujobejat.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/44619189685.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/28177287244.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/8hosa6fkhg8c2k03fieanj6iro/fimalelerikirum.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/cab6327d3e531438cc5c838548b0afff/48657139341.pdfIn PDF document text
    • https://mimpidia.com/contents//files/kanur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dell+m6600+mass+storage+controller+driver+windows+10PDF 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_off0000e7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AA 11208 bytes
SHA-256: 6554428a65409b41bc4d7e98b47566b1ed7ac3a8dca480d9e6f8ff5223801cbd
font_01_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 18572 bytes
SHA-256: 567cd9093f30a4e2a20edf66d96c818a24a5e2b6b577cef925373e4e03ec5fd2
font_02_sfnt_off000132e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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