Malicious PDF — malware analysis report

Static analysis result for SHA-256 541b0563b41b42c2…

MALICIOUS

PDF

76.7 KB Created: 2021-06-26 13:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f3764c56aec3b45fa8699fa2ed0792d SHA-1: b557ff4f0cbff18a7cdca78188a3458ad0a56839 SHA-256: 541b0563b41b42c287bfd193ef70e7f36ad844c8cdeba4c0204ff9ec08abdc2c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was identified as malicious by ClamAV and an ML classifier, and heuristics indicate it is an advance-fee scam lure. The document contains numerous links to external PDFs hosted on compromised WordPress sites and other disposable domains, likely serving as a link farm to further the scam. No scripts were extracted, but the overall structure and content point to a phishing or fraud attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jn6stagpk9g3komphlq74dklfg/xipuxiful.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608b051320457---90865549669.pdf
    • http://dvarenda.ru/upload/file/xuzuse.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080beee6dce7---kuvurakulegiporulixevu.pdf
    • https://bodymason.com/user_uploads/files/josaximojulixaxi.pdf
    • https://actor-conseil.com/files/file/29972964728.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092a241b7a49---jikimesikubisovomewojaket.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/3a2ae05d9d71bfe7f3b2befeb315f981/60915549197.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/93d2f5cc5e9303cec848d694d01e4d23/gafojonawod.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b323ce81d64---timupawinabifu.pdf
    • http://akcjonariusz.com/UserFiles/file/45338085995.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/nkh8d6rahekq3ujbl4uhp7b3n1/63976926541.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18e6697cc---2907079504.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/d2e065869638035369ae01ec0ad054e2/wivufobo.pdf
    • https://toromecanicorodeo.com/files/6421407054.pdf
    • http://sosnovgeo.ru/userfiles/file/xesodozegudezero.pdf
    • http://reutlinger.pl/userfiles/file/fadosofakorevip.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/d0dn56st91ojvsj9eq1ecddltc/felusewetogupadekinew.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3220c38434---73079596138.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16073595df2dee---32120099334.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089dbd920820---50470189796.pdf
    • https://cambodiadriverservice.com/userfiles/file/vegezawaliwarit.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/76251516474.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/f4c4016178754ed3d1a3ffcd74afd1c9/69205044540.pdf
    • https://gilbertems.com/videos/file/97631318600.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=verilog+frequently+asked+questions+pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/11dafd5a908aa963bc408f03806a648b/lewivugojapodik.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_off0000c81c.bin
c4f5d06e9bcb6d3527fbb1a0f733b00df334641d0e177d1f7a29b409c14d7660
pdf-font-stream PDF embedded font (sfnt) at offset 0xC81C 16956 bytes
font_01_sfnt_off0000f3d7.bin
e271fbbbb4564adcc2d683a49abb53f3cc109c991065753acff2282c72522102
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 11096 bytes
font_02_sfnt_off00010d58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 16792 bytes