Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0dd7b89a8c0cd7d…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 21:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8d3dddb3f436222aafcbdb6dbb1d67c SHA-1: bf8e4664fa4611a863d82470cf55a32a1d2af44b SHA-256: a0dd7b89a8c0cd7d249556974089473b9c580a1503d2738d85626746b8dd3133
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://huntic.ru/uplcv?utm_term=what+is+the+best+rpg+for+android
    • https://maintogelonline2.org/contents/files/5512476203.pdf
    • http://schubert-hh.de/image/file/jisapagemezinavonis.pdf
    • http://klinok-saintp.ru/files/jobizupatijilutusuzase.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/85822fc3e502b98195e26c2cb4dbdcf6/visowuwomidofitepi.pdf
    • http://hrdiborice.cz/erucom1/files/files/kogopexitusisuzusuxo.pdf
    • https://kidneystonetreatment.in/userfiles/files/22497013241.pdf
    • https://nevjegyzek.eu/uploads/file/wojarebosalunud.pdf
    • https://signika.pl/Upload/file/ziparobonavenigubamezup.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139265b3af06---8029674116.pdf
    • http://design-klasse.de/ckfinder/userfiles/files/navopozot.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614557344ea03---68224475571.pdf
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/vulonigadejoraj.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/11812261501.pdf
    • http://directopinion.biz/uploads/FCK_files/file/nadejoxari.pdf
    • http://tcgardening.com/userfiles/file/2021091403280173499.pdf
    • http://photou.cc/ckfinder/userfiles/files/69363572703.pdf
    • https://tp-pos.com/uploads/image/files/45848327321.pdf
    • https://ltes2.tw-goods.com/UserFiles/files/pavomevogozolaniwu.pdf
    • http://kool-house.com/upload/editor/file/63716616318.pdf
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/36731590951.pdf
    • https://taevlingar.se/images/pages/file/vawowuliredojitamam.pdf
    • http://nhahanghienminh68.com/upload/files/72638768902.pdf
    • http://erainbowrealty.com/userfiles/file/sifazadejebojisarovu.pdf
    • http://tuvanthanhlapcongty.biz/upload/ck/files/8199503118.pdf
    • https://nmcs.ca/userfiles/files/vokuvumamipobolezej.pdf
    • http://romanakladatelstvi.cz/userfiles/file/15235653230.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_off0000cd96.bin
b5a115072e4c089b2c2a8f18622b38f251107b71a57eec09f7997c75cb79d42e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD96 18388 bytes
font_01_sfnt_off0000fd33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 16792 bytes
font_02_sfnt_off0001154a.bin
e620d00a2f122393906f960cd7f4820554d66f710f54d59e1b188fdc0d6d084c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1154A 10864 bytes