Malicious PDF — malware analysis report

Static analysis result for SHA-256 2941685e71c186d6…

MALICIOUS

PDF

88.2 KB Created: 2021-07-16 07:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e1baed65217706f2d6a5d51df512005 SHA-1: 0fa97c2af50e135ddc86a53558245b6370b9464d SHA-256: 2941685e71c186d6b97744679984108eb98f203dee87c8eb2a9e465298ee91f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. These links likely serve as a lure to a phishing page or a download site for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/a76c6c44c3eb33137e4b788105103f64/lutalovimum.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/60ceba9c279f3874021168817ab7cc2d/jenifumibuboromifotalul.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4d62d2adb351c8defc239a0b944df827/xunamofu.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb64a53c898---xogogogidewilera.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/fi7p93rqht5l9rh4u08mb8i96h/30275931724.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/430d507c2ca90852d47554907b85b9ac/wosunexolamoxadagij.pdf
    • http://kapelski.pl/userfiles/file/48811845366.pdf
    • http://lubrifianti-auto.ro/files/file/zurububuzelevoteradopebeb.pdf
    • http://frangarcia.eu/upload/file/21214888999.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e2164297be3646622963e77310254b5a/xudolorurepadev.pdf
    • http://alexhoffordphotography.com/temp/files/file/mubanovutimewenazano.pdf
    • http://geombiagioschettino.eu/userfiles/files/15965825183.pdf
    • https://audit-advisers.com/userfiles/file/31786959160.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074326c820d9---nabofiwelivaxazavido.pdf
    • http://staropolski.net/Upload/file/zidefok.pdf
    • http://falconartistmanagement.com/ckfinder/userfiles/files/24072120080.pdf
    • http://sns.hu/_user/file/vagosowiv.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/216p64riucpii6gj0d2in1nutg/tolodinaxapaxobagok.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607301814ed0d---46319096289.pdf
    • http://myblindz.com/fck_user_files/file/vodozilevalakafejew.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a99a7ed06---lavuxebabiwadan.pdf
    • http://zzweien.com/d/files/21771039372.pdf
    • http://thankschicken.com/uploads/files/jipofulitozubife.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/2789422142.pdf
    • http://bestbuyfromindia.com/userfiles/file/215342724.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=total+electric+flux+coming+out+of+a+unit+positive+charge+put+in+air+is
    • 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_off0000f301.bin
69dfa47e511ede91a70b6f6ded5f082e26ea48e7a732c16bb01561bae7a597a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 17608 bytes
font_01_sfnt_off000120da.bin
e9ef645e61160b1cd1bc11439b2bc993263a4f0922d63a88de71e5edb689b181
pdf-font-stream PDF embedded font (sfnt) at offset 0x120DA 11156 bytes
font_02_sfnt_off00013acd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACD 16792 bytes