Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bbcb4d6b61356a…

MALICIOUS

PDF

83.8 KB Created: 2021-08-26 08:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c7f2d0c15d809bb3e1f8317eceb510b SHA-1: 009d3085861f79a2ab412ba89a1ae52bde4d79d4 SHA-256: 66bbcb4d6b61356a72094074e42bef99f4712a0b6264275b5bba5acd227601b4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=the+resilience+scale+for+adults+rsa+pdf PDF link annotation
    • http://bafiti.com/sklep/userfiles/file/xugufumuzuma.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/solefodojevosiselu.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/22535493030.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078a316cb55d---dusumipotumobanevelakoxa.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a985fc8469f---rijoredulepimotakosumex.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a309a324e15---71157246308.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d2ef6a2d4d---mevejirakopivotizega.pdfIn PDF document text
    • http://www.toptehnik.si/images/jilexorirukuxudoxe.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867b2da6ff4---fuligizuvinirugaf.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082e66986761---waxurufixa.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/sajaxepalojug.pdfIn PDF document text
    • https://chptravel.ir/data/file/wefubogak.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/13611503572.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/161107c2fa0be7---tokudugupusuzuxil.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/63091527488.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/vozilodunivotusizera.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/42233557712.pdfIn PDF document text
    • https://adikkedua.com/contents//files/32324102192.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/xufusez.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83d899ffa---14686387698.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d4fbcd9d734ca72399f7406d2e873f11/dovev.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/fovijubikuvigewipewuzoge.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/75616960329.pdfIn PDF document text
    • 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_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 16668 bytes
SHA-256: 7454a42289ad73ba7845d839172b4c33488c9ee503a4415bb8590937db77107c
font_02_sfnt_off00012814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12814 10780 bytes
SHA-256: ae36bed5ac34b1c70b9a7027ef65991a9c1d967f5703d613989a4b94b77e252f

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