Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3ad2294b1edbd5…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 23:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a61b3bb7b9c591d80197e3ef9a8ba7ff SHA-1: 4c666c1a140d4fc42cf7e41c33f2dcf95243379e SHA-256: 9a3ad2294b1edbd54340c97506723fceabb6a604b2f429a46221469f2b5b8d7d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to deceive users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://digitaluzaktanegitim.com/calisma2/files/uploads/28402778140.pdf In PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/56202642049.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/36914721619.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/vederikugusafogom.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141888864f73---98677449514.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/hu2idlrh2noiccfmlv94nt7st7/jopuwurufevawuvulo.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/51136868295.pdfIn PDF document text
    • http://gapp.fr/medias/files/33948062306.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/nipepobojuxokemojexonufe.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161308d1f036b8---94921307424.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/64411836392.pdfIn PDF document text
    • http://dsraxys.com/uploads/82358058824.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/78759642662.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/36267107999.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/fasibinomokuzupu.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/85319108432.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/kadutamodigofaxaw.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/7346329426.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/lipazanamonopag.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/55355984401.pdfIn PDF document text
    • https://moolans.com/uploads/files/31850993045.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3488e3112---86978178236.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/vosobefusimajisofakilugi.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/5373013228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+apps+chromium+osPDF 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_off0000b08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08A 10584 bytes
SHA-256: 617f69d6015f46e8bc84b660909ba15b8be9a9804752e1b16e6e759a635b666b
font_01_sfnt_off0000c874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC874 16552 bytes
SHA-256: 0670b0dc5f44d3b617d839cc7a3525a67016a5207da36c36ddfbe65ae5cb5c4f
font_02_sfnt_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1