Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d108fae35583468…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 18:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec8d522327fc22323a6268721dc4bd95 SHA-1: 96b86de511848b9827dda52fa480ab780ef3abef SHA-256: 4d108fae35583468c46739823041289db8014fd0f34aa4071524f6b514ee261f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories and disposable hosting sites. This structure strongly suggests a link farm designed to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://fentesmakina.com/paket/upload/files/supenurijevan.pdf In PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/9o6jk9nbbjkgju5stcou5ik639/64212426656.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/46864004345.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/mijefikuvonilameturos.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/a943999f1c57d2d9aae02f1ce52c4697/zoripudelapizinatubulonon.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36195747ed---60503734546.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/benemukakifiwuwitusemu.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/10e9c81a504e082a2560e545584e90bd/44381296157.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/rejipirexuwu.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/80403075077.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/46685277023.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/waxofukixebuvobibet.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f02362bac---36982626174.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/xusejosemaxonobilonibavi.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/45461591772.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4bbc3cf07---56246855809.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5cc8b912b---69534507347.pdfIn PDF document text
    • http://vladekoservis.ru/files/30331663573.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/wazaterutixosip.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ce2864bbc---70740861177.pdfIn PDF document text
    • https://raljob.com/userfiles/file/83621914982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=red+background+wallpaperPDF 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_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 10792 bytes
SHA-256: 42884182cbd93977b3070b53cf5619e48dc0429785cd688143eac56165c8334f
font_01_sfnt_off0000fa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 19784 bytes
SHA-256: 88fe2d92ebc4a91d2f6e118685aede80e400b1b542ef860000f0b9a3aaee7182
font_02_sfnt_off00012c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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