Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6fd7b7852d5d4e…

MALICIOUS

PDF

88.3 KB Created: 2021-09-17 05:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 47afe029b9330bceb38a3a104a3d5cf1 SHA-1: a75107d37ecb068bbe8134c79161995d0552c281 SHA-256: 5d6fd7b7852d5d4e326ede621a4a20dc8aa7f28e41dea8837d51abbe9759d020
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing campaigns. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=sony+bravia+android+app PDF link annotation
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/33089670826.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/wefolovugexugafowurobe.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5f320eeb7e06e0543ed0e2dc75c37dd2/3605364433.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/porefekefepe.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/felisegexajarev.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/futevazifabonifuvokot.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/misewozukitedijofi.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/29133272580.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/338b5cb9496249b09f43c17cc3ce1ed7/83977542194.pdfIn PDF document text
    • http://fgosvo.ru/files/files/toraditagudixem.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/11524644093.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/18837308600.pdfIn PDF document text
    • https://curvy.tw/upload/files/75717501377.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131e25ebf07b---35174124856.pdfIn PDF document text
    • http://capableapp.com/uploads/files/59132591894.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/67354773753.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/sujesobi.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/sovilepujedifasosesox.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/in69etkoi87c3ph0k15pfjad63/57021864537.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/dafiwebafoze.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/97748938495.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/letevazobalozewafenej.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210907_459AF683F8A3DAFD.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_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 19144 bytes
SHA-256: 434b24f757ef5fff10850f9208e23b905022a077a38a576c719be78c95b7227f
font_02_sfnt_off00013c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C95 10336 bytes
SHA-256: 983ab163622ebb6ec4d619b628da5a1f0d79a09e1a1e0f1576a220eb9677e21a