Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bd38b914c413e5…

MALICIOUS

PDF

85.9 KB Created: 2021-07-14 06:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18fb5cad5b71cef4f4b658a7453df0d1 SHA-1: d423d1c9679d511752f1da1a6bd196d5d6cf68b3 SHA-256: c7bd38b914c413e57260c44e1290228c6a2b6df5bbdcca86da85fb173f67804e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The PDF structure and embedded links align with tactics used to lure victims into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://xboxheerlen.nl/userfiles/file/tezevosatikesoxuwuvud.pdf
    • http://zge-led.com/luodan/images/userfiles/file/zabukaloxug.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/t9ib5avdm51i1vv3gsqkhgq3t1/pemamogidakedabekiza.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c4d9c713f---11822933994.pdf
    • http://szymonadamczyk.pl/uploads/fck/file/5392699392.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/180bbb761093d1b937881b22b90b5855/mekixitekinomeludeza.pdf
    • http://servis-hradec.cz/files/file/sopopefizubufin.pdf
    • http://austria-ex.com/images/blog//file/suxuzipupali.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/5d544913f4de23b8a0b1441eb286dc3b/rafazijaf.pdf
    • http://baohanhranghm.com/upload/img/files/suwafajinokanu.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7628d57cc9---xurug.pdf
    • https://heatingboiler.ca/fck_upload/file/vidijoluwujebazuse.pdf
    • http://pnmanagementsolutions.in/uploads/19067881620.pdf
    • https://solo-enoant.com/content/files/files/37501711090.pdf
    • http://acmemask.com/upfiles/editor/files/82965804731.pdf
    • http://vtvxm.vn/userfiles/file/fanabo.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608280e950fb7---xokab.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/c66bdde6b79f3b70065b5ed8faf4eb92/papalurigidigofit.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078556f039c2---depezemodefujeludorulav.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c936f2ec9078cecf1b15611b6bd75c3c/32740827352.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9127b83ba8---sokuvigujaxipiwif.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609972d59416d---96891282162.pdf
    • http://originalcheck.it/public/img_admin/file///46220416172.pdf
    • http://panziofabian.hu/fck_kepek/nudutokerilupemimuwaf.pdf
    • http://musikpark-live.de/userfiles/file/piwaxowupukexegozu.pdf
    • http://a1-automotivegroup.com/upload/files/ramiditinisugowuraleku.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=verbs+to+use+in+essays
    • 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_off0000ee9a.bin
4413e42eb4b04001a22ed56c3105b651509fbaf6f4fa00b2ba8263f28913607a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 10380 bytes
font_01_sfnt_off00010642.bin
c40cb1bef8e4052024ea5e6f690c2ec72cd8bc5a4561e4fc517117c4ccb5c6f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 17040 bytes
font_02_sfnt_off00013235.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13235 16792 bytes