Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4ebb8780cf2f3b…

MALICIOUS

PDF

88.8 KB Created: 2021-06-26 07:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96af6d4c854c39bfbed5296568e8e6ea SHA-1: 235d24b8f1097e8dba0fc554629f260aa85ed5c9 SHA-256: 4b4ebb8780cf2f3bdf270f0a35bee759f8ddd0f64bf1b831cae427f8a5a45682
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, indicating a likely phishing or malware distribution campaign. No scripts were extracted from this sample, but the structure suggests it is designed to redirect users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://wastran.ru/uplcv?utm_term=the+si+unit+for+electric+charge
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4172603fc---8031778593.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/87q4b9q5atc6jaohu1gnpna8vr/351515097.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/17e6c08f0f1df2f17fdaffda78e13d69/52592478090.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4c9844a1c---111524914.pdf
    • http://lokale-uzytkowe.pl/uploades/fckeditorfile/buvisixijuzewubaxemiwowu.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/35959140757.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ppdp2b36fis8d40mecvbjbaac1/21283851623.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/d5060ab24f938f5dab25fb628fca9794/99318811243.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/nf33u5ao8bihns59m2d25csk40/2681065851.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c6813d9e8d7fb698afcdcbccd54020be/40834389822.pdf
    • https://farmaciasacoor.com/site/upload/file/88218248157.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/45170332c82e7f5a2231bf6dfffbfd96/bagikigixifukabo.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/r2jle175sonidqk5epmal0q49o/49277828628.pdf
    • https://avigailpekelman.com/sites/default/files/file/vapad.pdf
    • https://legouic-peinture.fr/userfiles/file/1746668917.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ee4db5f14---pojixex.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160774082e0fed---88756071265.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4dac630948a45c012e06f8624dc3651c/55217362680.pdf
    • http://hkt-optics.com/hkt/images/userfiles/file/60757617872.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/qunopoaqd3n37gq3ldiu70b5p1/jidajaf.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91e3beaed4---lojudulunupapebef.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096430e1fc73---96281109089.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/12305001737.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/t7prcq6foh2fmi1hnkq5iaqpst/suzisixuzemiz.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f329f4f146---puvigolujipus.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/25224424772.pdf
    • http://dralituncer.net/userfiles/file/5439650513.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_off0000f802.bin
4c419e860dbdd6af1aaa8c79b83622ab24952cd9c2a866ce9c0bcd3f420362fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 17616 bytes
font_01_sfnt_off0001253d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 16792 bytes
font_02_sfnt_off00013d54.bin
3bba9afa3c03d847604432cff19443aecb4b67205b86f29a23d4a6d6ccde114f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D54 10676 bytes