Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30bc293724e9f3b…

MALICIOUS

PDF

84.9 KB Created: 2021-07-16 20:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3928e2c9916550ed17a23bdc9146a3e SHA-1: 2d042f0eebfd0ed8805b11637264b9a264d75b68 SHA-256: f30bc293724e9f3b932e36ac8fef4557aa296cf1ba7aa63688eb7fdc7112f875
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories. This suggests the document is designed to act as a link farm, potentially for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://geostudio.eu/userfiles/files/vakobenifuja.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/cema73mgi768srmeim1e1e6oc1/62989410838.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67828838c70a0e535c63ca82252945d8/xiridelanuvukitojup.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dphmsnr1vf1aikvvs1ogm8q6n1/bedugufororu.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd336f95be4---datadusirixopiligaxovabe.pdf
    • https://abofahed.com/userfiles/file/ravegujixipenoworawedane.pdf
    • https://pemaboutiquehotel.com/assets/userfiles/files/fodinanarekasujumisuwomum.pdf
    • https://hr-serdahel.hu/images/file/39041834157.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/jar57m44e08s9ba5k45pam2647/52670952133.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/d6c9e7851ca34dbf44af9538d660cbe0/xiwavuv.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/4am03pmknlqadb3spbariidhml/9965851502.pdf
    • http://brandnewgoods.net/userfiles/file/fapobogupaxexalulodixigij.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160d0178fc3479---73974071359.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c037d24bf0e---mebulusojawijofomoloxofis.pdf
    • https://heatingboiler.ca/fck_upload/file/57548732858.pdf
    • http://lube-stc.com/ckfinder/userfiles/files/26692775251.pdf
    • http://fujavietnam.com/images/Download/16599820263.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c79aea8172a---95711996562.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cadba8e948c---toninexodamozisugizemone.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bab2219e42f---147568615.pdf
    • https://debcopharma.com/userfiles/file/lerameduzidutuzagusem.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d1cedc33c1aa7f2fd9ad52a5706a51c7/marixevadewafonegojivi.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14558077b---77042060676.pdf
    • https://partnermind.cz/images/files/jaxifigomewazabilu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=triglycerides+in+body
    • 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_off0000ec02.bin
1fade0be70042d6fb47b35c5b42e99859d205afe2118978ea66ff1e6dbb38906
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 16512 bytes
font_01_sfnt_off000116dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 16792 bytes
font_02_sfnt_off00012ef4.bin
678c0beec446a06c1d437db02e80c992938204dade7787d2155c2e9c34bc1a12
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF4 10500 bytes