Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2e3acfc9eba1f4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 09:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e3ff86b5b5593f691af68645f23c6771 SHA-1: 28235caa39d3e0d6c1e86de99ced1c868a38d8cb SHA-256: ac2e3acfc9eba1f4dc4856b233cad7e51c38e47a546e69156c82c791cd4ac0ac
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users to potentially malicious content. The presence of compromised CMS upload links further indicates a malicious intent to distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=how+to+connect+otg+cable+to+mobile PDF link annotation
    • http://autoset66.ru/admin/ckfinder/userfiles/files/81330999233.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dbe8542bb---97404352991.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/12101336938.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/petabisegazigusajev.pdfIn PDF document text
    • https://ms2oke.com/contents/files/40578197355.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131236cb9244---46110909798.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/68303893262.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/67315251428.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/mutamatagudif.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/64828973648.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/kerob.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/sibegewozakufa.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613950ed8f9dc---zeburipudu.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/wufifowipebonurelika.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/gunisuzegojinebesimewatu.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/zufudatikonugemiwalu.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/godukofitifokamofa.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/58558796614.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/jogariduxuwa.pdfIn PDF document text
    • http://redactron.com/userfiles/file/begalimefim.pdfIn PDF document text
    • http://yepuco.com/uploads/files/susumape.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/23742289259.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/binuloji.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_off0000d7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CE 10520 bytes
SHA-256: fdb4ba4e83ae25dc156886e9a1a2291fc11485004141d43c2cb4b6c3259a3cbc
font_01_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 17652 bytes
SHA-256: 861462b4a66a55cbd8dbf312c0826c09240bbe7bb7628290c57b86f02f241191
font_02_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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