Malicious PDF — malware analysis report

Static analysis result for SHA-256 d235e38a93e3c304…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 22:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9d753ffeb984a467fdb878f7bca9d235 SHA-1: 3fd55b5f2d4c92de552248506908b4026c077e7d SHA-256: d235e38a93e3c304827948a13b44073bb152383476b35eab77b05172c390aff6
176 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting sites. These links likely serve as lures to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://rdw-wolf.de/backend/ckfinder/userfiles/files/80636346100.pdf In PDF document text
    • https://cape-electronics.com/media/file/vutovesogazezuji.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/1018187205.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/38301289364.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/xusimorizexakemuwe.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac767d0671---37431371538.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/90682754553.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/93142876090.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/82573544756.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/65129954543.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/zanasu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084870f2897d---54262780242.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/94526916916.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f27579b38---54790102635.pdfPDF link annotation
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac93ce9e30d---mabogukimazarukigaz.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/gazepazojewavoga.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/52920474136.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/78330645147.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/koxugolovaxokinuvifef.pdfIn PDF document text
    • https://xistenze.com/files/files/50933391137.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/38991865157.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5cc1ae6964c29476287c4ae054469beb/vikulamipuwumofijelazu.pdfIn PDF document text
    • http://www.77ice.com/upload/files/16386247030.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607473209ccf3---vomototitibumosetaxemi.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04fc4d494---gilugobapelanas.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/79490295086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kerala+co+operative+society+act+1969+pdfPDF 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_off0000c859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 11068 bytes
SHA-256: 9035266e09335ee6c5ffe58b9494943e0b850f476d45eb6a378b2d725f842825
font_02_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 17744 bytes
SHA-256: 691c00b3f6d210380dec69e0a5d1b685dfc91a32e4aa35d0b6931d353d0d888a