Malicious PDF — malware analysis report

Static analysis result for SHA-256 170e520d4dfb535a…

MALICIOUS

PDF

82.7 KB Created: 2021-07-03 00:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0049d2cb0d2cc6cdac3a5af808b23395 SHA-1: 95f23374375087e759777c58635f3f4cc162572b SHA-256: 170e520d4dfb535ab0cd085c1eed2aab409d0dbbaa5e00756062e357b6542d16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

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 https://philabc.ru/uplcv?utm_term=how+to+open+word+document+as+pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d88766d1e1d---lorukevedegovelagev.pdf
    • http://hyosangjo.com/userfiles/file/20210618030117.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/r6666os8r2fgsao03pdm7e1qt0/ranavowarixojaji.pdf
    • http://zae.me/datafiles/file/felekuxixovezakiriruw.pdf
    • http://wang023spa.com/userfiles/202106file/2021061213460970554.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/hitfc2hbc6utgteb4v29ae7jf2/66409645632.pdf
    • https://anjingliar.com/contents//files/91039311667.pdf
    • https://iamtimeshare.com/userfiles/file/fedalenibi.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/81a6b674a0adde633934b928012bfa28/metenotivizapuvovowu.pdf
    • http://pratiklinik.com/img/userfiles/files/92759376705.pdf
    • http://proxima-design.cz/files/file/sebinojozoluxik.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/47b38c65ee1bdc20be968683e5dd49b4/64695441568.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/6d748e8b16874691ebb35ce7507750bc/61084171062.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/7967818414.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ebdcbe4eafef703a6511087ab86aabc9/44265698576.pdf
    • https://accuratesearch.com/userfiles/file/17073539352.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ijkj5d4a9eev045oep2o4v31g7/wuxutajazegukopokonet.pdf
    • https://angkortaxiservice.com/userfiles/file/97101000889.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/7340893168.pdf
    • https://kaptenhoki.info/contents//files/14285920677.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d896e316c---dovabofajivivofigadax.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/7b21901d8d37705972966ab5f96ae493/rasimudugudawewekuwef.pdf
    • https://atphp.ch/userfiles/file/32434838972.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0f7004d7b8cc1d3f4bd282fbed17ca5b/noguw.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/bf6bf86fabd927e1ebc1dd2b71675b23/56557218882.pdf
    • http://abnicum.ru/files/file/21868795576.pdf
    • 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_off0000e08f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE08F 16792 bytes
font_01_sfnt_off0000f8a1.bin
5ba19bda73a2f721234cba415cb1a59e57317fcfac8a7f6e16a3bfe620fabc91
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 16812 bytes
font_02_sfnt_off00012495.bin
d2b565b5e61dbdab0c55a333e3832335c1318f5214a2be39503a3df123b36511
pdf-font-stream PDF embedded font (sfnt) at offset 0x12495 10820 bytes