Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc41cbbc5391c198…

MALICIOUS

PDF

87.2 KB Created: 2021-07-25 08:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e7d33b9c8df1418ecc5053e3fff69d18 SHA-1: 79c65a7ca306fc4b0527399f8385fc0b84be187e SHA-256: fc41cbbc5391c1983a5abf147388f9edab3a0cff1f5e9819ced4086203028e71
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other potentially malicious domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. ClamAV detection and the ML classifier strongly suggest malicious intent. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/5e1498d86cc186ab348c4119f2bb676c/vajelulebilepot.pdf In PDF document text
    • http://extintoresorigen.com/images/editor/57005740511.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/lidirupona.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/loleronimarawesivumak.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/pugepida.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/c76pkdh08cqbtbqbvbjgue8n96/85061184208.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ea8316f79d2fc0f2b5d8f795ca4c7d51/54408769102.pdfIn PDF document text
    • https://csodamalom.hu/files/files/juniz.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2e65d48795dd3b5de408ff933c4b78b4/nopisakolaxegoxogigabuw.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/setofukimoji.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/molalaromixajabida.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/numewedukukuwajekin.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/xaxulowatuneri.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160869e87791a9---tevibaseluxogisot.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/133e7ace0488d6ffac6a545c58fd2ce1/kopejowiberaduw.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ef4601fa9589edebc61745f4492ed9b3/kasuzebo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160834824434ec---lafoboxujalofini.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/mfohcaf6bkpcudmccg87k1di2p/54739856046.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/l7r8rrflikg6k5jerc6b95jcle/19163779787.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a83ae03b2---80356446978.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf180b9069---91431752408.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/ruxejazafejebir.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6523b96ae1---81368060814.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16079212f7f0c0---zotatine.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/66127229388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=non+action+verbs+full+listPDF 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_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 17004 bytes
SHA-256: 9f9bb6f24b16a890568e4040a75f8f02a9817c32e228d8847d1c0567d85eda3b
font_01_sfnt_off00011db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB6 10612 bytes
SHA-256: 3ba5d83b710306fc5221d481652b83659345fc7893a717cab3d0cc33ab13112f
font_02_sfnt_off0001362e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1