Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec6835576359e01…

MALICIOUS

PDF

83.6 KB Created: 2021-08-20 00:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d95b14c522e3d7d1c995299a3425c6ea SHA-1: e52f9b4a83b71646bc187c02e26a1d2df0ee04fb SHA-256: dec6835576359e01ef2be252bfb5bb2e34986716a7252abc956a68263094b2e4
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm and a phishing attempt. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://cesishotel.com/res/wysiwyg/file/labunetaba.pdf
    • https://zold-kommando.hu/files/64013700635.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/vubixab.pdf
    • https://efnnma.org/files/file/65208778361.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/46ef74e318166efbd226cd579a417386/wotolosubezibipegixakik.pdf
    • http://senseoftourism.dk/userfiles/file/40438360969.pdf
    • http://strategie-online.net/catalogue_dynamique/file/11034908199.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/6d3b00033bab31ff8536b12c2c6fefb4/nekapalabopegevatepo.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609164ba7c9ea---48784211444.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ab38236a8080bcf1bcdd6f0704bcd537/16933529697.pdf
    • http://samuiluxurytravel.com/Uploads/file/susewoxuxuxaki.pdf
    • https://habibitours.net/ckfinder/userfiles/files/31572153028.pdf
    • http://aa-nusd.jp/85940073348.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160dcaf044b0cc---rorisinizuxekof.pdf
    • http://riskhedgetech.com/uploaded/file/82999982660c5dc5878f53.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ccml0lju3sgqp28ulll3lth1aa/58463716818.pdf
    • http://knshzj.com/CKEdit/upload/files/dufanaxipezufolazuzovokol.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/5snumr1aqorg517vscfb929bcd/21951659724.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/118c639dff7ce1d52983e1a85b58a9f9/25329137056.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sh6rm6uc9glkkoji1bhtbmtoo4/jurezesotudafusazuxokoxa.pdf
    • http://ristoranteyuri2.com/userfiles/file/7194353613.pdf
    • https://billard-hauri.ch/userfiles/file/sinog.pdf
    • https://internationalmedia.com/userfiles/file/53233151628.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b435c464bb---sufojejivefudule.pdf
    • http://www.peretprod.ro/content-images/file/remabobatap.pdf
    • http://0vote.com/ckfinder/files/tixugisasukubuja.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=criterios+de+congruencia+y+semejanza+de+tri%C3%A1ngulos+ejercicios+resueltos+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b7.bin
f764ae586d0345ffdb6a889beaf811c271643819bbfaa285b710431d5c0fe05b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B7 18536 bytes
font_01_sfnt_off00010977.bin
a5765c0b9a8b56d8123806ea0d491e0e636a2192985acd737e0023fd8f775d8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10977 11576 bytes
font_02_sfnt_off0001246b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1246B 16792 bytes