Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37082f76be7537f…

MALICIOUS

PDF

87.8 KB Created: 2021-06-29 19:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bb0af1eb5c795338225bf7cc974bbd3 SHA-1: f7cd52ceccf447db4b4b431ccc49e104fa5e9c0f SHA-256: c37082f76be7537f595d5d4b479e009e17a51dbc27e044575adba7e9f5ba81e6
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of raw IP address links further indicates a malicious intent to direct users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072b86502a7c---kipebala.pdf
    • https://amblamy.ee/upload/file/xaxilesazofaxumimati.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d259ecc4cc---59692565471.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160708671ca511---zuxeva.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1692a59aa9---moxakusixene.pdf
    • http://dush-kz.ru/uploads/fck/file/jawirefulejugupek.pdf
    • http://yasaitogo.com/uploads/files/mulodexorijema.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b63e889df---17846698069.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090f28d3cd20---gawosapizumumuwoj.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc876dbac0---59167551354.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ce4123ee7---jimomozuwufimi.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/00cf815a21068939d34607c53955d0e8/pojede.pdf
    • http://dzwigipoznan.pl/userfiles/file/16457051667.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806faf9cfab---78031300803.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f6b46769f---68911846395.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608556d6b00a6---34633386047.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1010fc0e54---zineru.pdf
    • http://billsky.ee/files/file/24147843783.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5dog751u8fjkhumk4pepbt8ig7/ritilabawuve.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/cde281187311e57ace3088cd8653ea71/nepukizomo.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f5402df674f8c9c4ee602a825e09d652/jidinarigemafijupavu.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/831e9db084c0d05e45af3d1b38ecb2a0/71084940987.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0097456830---81051294867.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa415b776f5---66819162688.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/lapil.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cloud+computing+notes+for+cse
    • 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_off0000f2c2.bin
c8ba53309f389bd81dc7b3a1438e6e808ce51923030fb93fe8ded87198f9f31c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 16948 bytes
font_01_sfnt_off00011eff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFF 16792 bytes
font_02_sfnt_off00013716.bin
8abf767ae57080b5d1c1ba1683fd28dffaca8ac897d56d25d101de82fdf19b2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13716 10932 bytes