Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83ac173b3e430e0…

MALICIOUS

PDF

79.4 KB Created: 2021-07-18 23:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb39c3752e7fa24a3c13ac2acd0079f4 SHA-1: 6eba50f7eae664856b4e5ce8508cc6079fb50598 SHA-256: f83ac173b3e430e0663d9c34093d628e917513cd17ef1e7e2d2e587dd570f12a
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to websites hosted on compromised CMS platforms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, limiting the analysis of specific execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/fipigajamizuzomovusew.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160accaa4c473b---wekotibo.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898de05b63b---87411697237.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/vasovi.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/cfaac5c2eba61db029188f8a1e87b885/85135375153.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c11d729ea72---87830366557.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160780390c8f8f---mavog.pdf
    • https://dovolena-jiznicechy.cz/uploads/dimere.pdf
    • http://erbamedica.org/userfiles/files/15147043476.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e4c88df8f---motus.pdf
    • http://davis-wilford.com/clients/5/5d/5d1655677b271656441dfc21bb295863/File/jufukadupedi.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1f997b4d5de8ee86e6678e078a46fc88/58171055604.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073110a1afee---gexoxomaripuz.pdf
    • http://evevoyance.fr/adh/.-/file/sedegodubaxofe.pdf
    • http://www.clc-engineering.com/siteuploads/editorimg/file/60945295308.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160bfebb391a88---fezoj.pdf
    • https://best-label.com/upload/files/8267477368.pdf
    • http://tks-forever.com/upload/2021/06/20/file/mezozakeropiduxep.pdf
    • https://nezrenweb.com/calisma2/files/uploads/56044800998.pdf
    • http://fashioneducation.ru/userfiles/file/19532998807.pdf
    • https://hmanagement.net/userfiles/file/gurolotapedimutog.pdf
    • http://creativetechno.in/userfiles/file/76720075495.pdf
    • http://tv-sat.cz/userfiles/file/vijufasukisotazanelasukaz.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16201058406212.pdf
    • https://wecareprogram.org/images/file/mojuwemidam.pdf
    • http://anhbanglaw.com/userfiles/file/81940149227.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=coc+best+th8+base
    • 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_off0000d48d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD48D 16792 bytes
font_01_sfnt_off0000ec9f.bin
3a7050e2dcaa230b8dd4406d9b7ff53a8b989304f3f6eb1024e273aa390cee88
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 17064 bytes
font_02_sfnt_off000118f7.bin
c485b557fd763eea78890a403d8e80b09f14b7ccdd4d543fc12a19ca7e633cb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 10364 bytes