Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c035f604d33f23c…

MALICIOUS

PDF

97.7 KB Created: 2021-07-29 20:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06d423b414d851d5119e2a0e902ce801 SHA-1: a9a3f6bc2549ee26117f68e6352f5817e07c1042 SHA-256: 4c035f604d33f23c94be24c1983ecf05d481a162a715837a092dfb84765a281e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://nhs1980alumni.com/clients/878257/File/44167112467.pdf In PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/7jnhfdrjvu5rs521n03bt5q26h/sumetav.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/zanejejetasubate.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/jebatamenoladewuluwopum.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c418cd2dd18---41736678639.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cf06fc76c72---bosexitusuj.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/xagulegebupe.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/36293dc4e788173520d428d117a02de2/xobuvobubudexi.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a36016ed5---90270399321.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/zadapewaxonivotakemod.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/5g94p55i640hb47fa261jt5f22/jomanakijuvusud.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d04b2a1d---659866552.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/vitapiwobazinivibalaze.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/8d0va3ov63l919qfa4ng2aqsri/68199296462.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/sovipezotuzogajepaki.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/60219802593.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/92122152550.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c42440426dc---xigonedexudibaribuzu.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/q0fn644r3io3pbto8757vlpdo5/51670613092.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/gunadajulibilenazibafefa.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210714012427.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/lorerojarotujijijak.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/pitopavo.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/77040627494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=problemas+resueltos+de+potenciacion+y+radicacion+de+numeros+enterosPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB7 19172 bytes
SHA-256: e11ade34f4d1e27df6c912393677a1d97e426bbdbaabc360d6176071b3e6033e
font_02_sfnt_off00015ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE3 11028 bytes
SHA-256: 2603218bc6a2c210634400ae0b93d9fccac4a6884ad1d3c10e4f11e492a59228

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