Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2355485fca7c0d5…

MALICIOUS

PDF

83.6 KB Created: 2021-06-25 12:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb8982c40fd12458f4954e1136c6afaa SHA-1: f8c0000844ad4d3c2ba1af12b14f252963792919 SHA-256: c2355485fca7c0d57e587487add379a65973e7a54dcc8fb2d49de695a1b82ab7
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to lure users to malicious sites. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c31c382ab---gavojokixuval.pdf
    • https://rubenoferro.com/userfiles/file/tuwixokuz.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0ecb9ebb9---11812673336.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f37c9fea0---79579877491.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703b14d1cd3---73161804026.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/17e7905fcc3db464ac2ec50311d6635c/86072928820.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6fc818c65---mibibadudivesaga.pdf
    • https://pima-alarms.rs/slicice/file/kevumiliwog.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a4b604624---gikevudenasujevawimexi.pdf
    • http://ladyvenus.it/userfiles/files/wunufisow.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/bbe509fba00a11323c453227cf434d96/xewepil.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608816921a9ab---dulopiwogowogabi.pdf
    • http://ldbell1965.net/clients/85689/File/lifepavulalamazogoka.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1884ac734---xilekaxerajojomitozoka.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0454b876c5a377201144b6b23ac91c5e/89624824905.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e514ff05---jobonu.pdf
    • https://handientu.vn/userfiles/file/94372641626.pdf
    • https://adepotcustom.com/UploadFiles/file/20210527231834101.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=8+hierarchy+of+needs
    • 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_off0000e479.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 16792 bytes
font_01_sfnt_off0000fc90.bin
30f1f8db6812eb4c5a917a3f6eedb50474520005e4dcb4bd2ceef319e375845b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC90 10652 bytes
font_02_sfnt_off000114e4.bin
267fb871ffe1729fb2b4dd60f1b505a3997b343b986fa9d4acda1738ac9e9323
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E4 17228 bytes