Malicious PDF — malware analysis report

Static analysis result for SHA-256 308d6153dd2a6a4e…

MALICIOUS

PDF

71.6 KB Created: 2021-09-29 09:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f6ec55d63d1428607d034fdab6c2f2c8 SHA-1: af945766bcb12e4a17f032b92e124323844ce0a6 SHA-256: 308d6153dd2a6a4e46beb5dd957285b80102ed958e4e883c7f4c6f924084a6c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The presence of external URI heuristics and link farm detection rules strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://goodluckfishing.com/ckfinder/userfiles/files/sekanadomipafaj.pdf In PDF document text
    • https://gerbangkuis.com/contents/files/54668575753.pdfIn PDF document text
    • http://grupophi.es/uploads/files/riwusuju.pdfIn PDF document text
    • http://banquat.com/userfiles/files/kasotupugiwelesotasa.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/goruk.pdfIn PDF document text
    • http://exima.kr/userData/board/file/kezixitaboxen.pdfIn PDF document text
    • https://agatanorek.com/files/file/80265488348.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/10584822161.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/4647639438.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/kipodozedowoxip.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/gasakarepupodetisex.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/rabugotomebomolozuwifo.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/kujifijixiwabexuviz.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/70086008796.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/65260914010.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/628fmro5aqaoq8mnc6klmfi8b1/kanologatazavalejuloj.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/2438410329.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/5914773afd05313f1bf59047d7d7ba05/71487905849.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/vefevunokinubuluxutidilem.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f23918235c763c5872597bcffc9b6feb/80896734592.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/dasojujope.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/6e473eb062372fc151b0bd1f9c215615/rumolazumokunizopo.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/95249159437.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/nosuvibozaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=autobiography+of+a+brown+buffalo+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/31453451906.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_off0000b4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEC 16812 bytes
SHA-256: 0aa7143a9de9790695b7b9f327711d0f33ccaef691144633c2b781a65d3148a7
font_02_sfnt_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 10896 bytes
SHA-256: e3e2b446a2a2bb38a9a93605dd5aed044ffc1343542b6a7c66a06a389cacb73f