Malicious PDF — malware analysis report

Static analysis result for SHA-256 06510e3e4bae2f9e…

MALICIOUS

PDF

87.4 KB Created: 2021-07-18 09:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0747b6fdcc2cc69e624258901752b137 SHA-1: 29a006707569df5d6d5d567097968dee804f346a SHA-256: 06510e3e4bae2f9eb41bac496a54e0df6e05db5abd42043ee0b8588eec9e05cc
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified numerous embedded links, many pointing to compromised WordPress installations, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this document is part of a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607955d8a53f9---nodufaniwat.pdf
    • https://autotrans911.com/thread/admin/uploads/file/tolopawaxat.pdf
    • https://sweetburden.com/upload/users/files/diwatilobigenasoves.pdf
    • http://umffz21.ru/admin/ckfinder/userfiles/files/74923870978.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160713523521c8---sikeguzuzerujozixelo.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/c9fded09036f9b62ff4f5034ddf38862/zamizoriw.pdf
    • http://notariocprietoa.com/notaria/documentos/files/85106044862.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/9ef21271488bf53931ad4a429486fad5/19599452161.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c00ce0db737---dikonejodopobu.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be42496da36---78857107931.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61b65d025---dugiranavojiw.pdf
    • https://keralahappyjourney.com/ckfinder/userfiles/files/59225059490.pdf
    • http://tksvolga.ru/userfiles/file/duxebotajimoxokivimujo.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/9c651a8038a348e18fb80fbf65332f10/73284111502.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28ec3f9bf---tinozefilok.pdf
    • http://vom-ragnaroek.de/uploads/file/4443387932.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6cc2e9ef2a08c8c3d7cb4079a073bc76/53588931071.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/26b870f821fd70730eb10048eb7333fa/64996057256.pdf
    • https://netshopnepal.com/userfiles/file/40090953971.pdf
    • https://computerzone.pk/file/84451351654.pdf
    • http://srsheicha.com/uploadfile/file/56440416861.pdf
    • https://immo-macedo.lu/userfiles/files/fevomoronawek.pdf
    • http://flexa.cz/docs/file/37154471817.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a38188bc1---wivelikozelob.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5957704301---liwuwoxakuw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=elevated+iron+in+blood
    • 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_off0000f1fd.bin
b21b92fb13d5d0dcb20daf1934e3dcece9ec5720399e9344c1b2bd71391e06b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 18072 bytes
font_01_sfnt_off0001217d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1217D 16792 bytes
font_02_sfnt_off00013994.bin
116112d96a84c443bc28affdf6073fbcb98f2df1aa0cdd76b5ab4120b574b557
pdf-font-stream PDF embedded font (sfnt) at offset 0x13994 10264 bytes