Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d16c810a7249a6e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-29 10:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c220ce2494e0e623aa652b71be3b7c50 SHA-1: c36cc3ea20a0475cba70570ab12d6045473dae20 SHA-256: 4d16c810a7249a6eb2557e5279d2313dc58bc4fcd642e542e9200919752a5c9b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://goodfortune.hk/UpLoadFile/file///fefabodufuxojusenimevibip.pdf In PDF document text
    • http://mariopresto.pl/userfiles/file/lelonujofaveg.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417c517399b---dogebatuxa.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/80241993765.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/98458002281.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5ca42eeec---xakigemozizaduk.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1907899efc773bc715fa722658695fb9/matumaronavuna.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/loxodimobus.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/zugen.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/ropiranusakogewudede.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/gijiba.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210919062008.pdfIn PDF document text
    • http://handgun.ee/media/file/rered.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/5253231508.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/mosoxinumaz.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/jivesegav.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/pepuzezebeveku.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/sozijevolimiluw.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/povaxaseganuwunuzu.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/dijufekagasejorof.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e5f90356f441011f7afc1135494f653c/8330722325.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/malidisebap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=final+fantasy+13+iosPDF 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_off0000c556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC556 10292 bytes
SHA-256: a68bd773eb97966d8f5a6428a991f2f8a45628d59496990eb5240d26b4110643
font_01_sfnt_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 22152 bytes
SHA-256: 3c2a32e1d346338d603601078cbeca4205fc88dbbf868f036cca04386419b65c
font_02_sfnt_off00011698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1