Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d1fbd2f755ca67…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 20:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8beecb82877adcc95d07fe15d2dd74c SHA-1: a383e2ec3a8f2e020eda11719973bb8bac446f7c SHA-256: a3d1fbd2f755ca671b396bfd7134c3cd7bd6a08ef71fbb8a97f3ae899b4ae45a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary goal appearing to be directing users to download other malicious PDFs. No scripts were extracted, but the overall structure and URL patterns suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c7c9ed76c---30015257139.pdf In PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-1/20210901153155974086.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109021309354806.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/7luc569umneco30p5gfc8nq9m8/duledogules.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/pobuxodituwabojoxusugidab.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/50289142002.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/jakikori.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/82096455335.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/vukuzezipipod.pdfIn PDF document text
    • http://splogservice.ru/content/file/ririvozetarivifubazozu.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/bupevapejo.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/rurewenasuputegodawete.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/46101351581.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b504b26ca1---subaxokowonetimejokese.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210914/2109141348083630321cysi31k95as.pdfIn PDF document text
    • https://renewone.de/files/titakazeretijukotizotugiw.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b54859bf2f---76944823933.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/luvalike.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/26722075283.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/16052995540.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/92983392192.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/jozufunu.pdfIn PDF document text
    • http://klenderbio.com/upload/files/69413592582.pdfIn PDF document text
    • http://cosyromania.com/media/file/68808209466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vivavideo+pro+mod+apk+2021PDF 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_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 17380 bytes
SHA-256: 5569fb592ae91c07a2990cb6a2d0e475c1de9b2b387dcdcd06c98cfb7a919156
font_01_sfnt_off00011028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001283f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283F 10560 bytes
SHA-256: d99c922e566fc22f05f763dd2e49684a398c1e77b684d7e9c950f5151448e2d4

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