Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a897cf3ce2751ac…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 18:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03e418dc7e4a18fc4a21bf340617f3b1 SHA-1: 94b8e8b762cac6403afab73c10869dcde873e19d SHA-256: 2a897cf3ce2751ac8037559aef33d09510f577c6ccbb835fce04f3afc003e172
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised or malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are on disposable hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://archism.ru/uplcv?utm_term=el+arte+de+la+seducci%C3%B3n+pdf PDF link annotation
    • https://malayalamfoundation.org/admin/my_files/file/25852820722.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/59082692995.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/70115092888.pdfIn PDF document text
    • https://majubesar.info/contents/files/jazevex.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/20230970045.pdfIn PDF document text
    • https://fultoys.com/userfiles/wumolasimuzizebilosatopi.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/36874123686.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/nogiwumoloworimewenim.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/dakugirewenag.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4544145932.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/bisurevuba.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/8536628753a8ef24fd3f099862898bbc/47120882319.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/18581397508.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/gavosifudugule.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/il4rjujkhi8rl0thvg5t2dodcu/36326779623.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/590055172.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210914095204646.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/59556616515.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210902170138.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/65070513262.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161304e3da4f57---xukuraxumi.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/57792214571.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/92996335207.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/51309448492.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/50e4a81d506c36f1cdcd8bf4f7d6c760/kisifajodaxuwetewujezuju.pdfIn PDF document text
    • http://eternoohydro.com/d/files/96320811221.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_off0000dc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 18332 bytes
SHA-256: 5cc674a62c8688ee6ea3d8bf1353c0c827d7061414694044eee79b13867a0886
font_02_sfnt_off000122fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FA 10712 bytes
SHA-256: 0b1c28c50e2a104fc7bdf3d34fd56e3956eeffb138307f69e2b2d5b2238ff2fc

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