Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3d0fb72f98dd16…

MALICIOUS

PDF

75.2 KB Created: 2021-08-15 01:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8974234ad29e50cdc501a94a9b9b751 SHA-1: cf40c5e14b8d6dfd68a86024908b46f0527db0f2 SHA-256: de3d0fb72f98dd1679e65bbd61a166c4542321e44a6a6f9f184a600f70c081c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f358975eab---nejufilakadakesixaro.pdf In PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/70207204047.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/35710616139.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/fumuwida.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/27146846733.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608628992b719---41124332639.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/votesej.pdfIn PDF document text
    • http://kelvista.lt/images/files/41111582085.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/nobewapalirepizevivaxixek.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/slph1nc9ok0bhfc3vq27pfaaf0/sutowizifutamukekasamun.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/kadixixekokaledumodaponib.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/70610858211.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/zisofajikedaripevisa.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/785585b80b5a391bac848ac72e69a7f7/27268946588.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/26105343797.pdfIn PDF document text
    • http://waypl.pl/upload/File/sizosewen.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087676c0eba9---lewoxubososatelusimunew.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16089eb291018f---gebelunipuziw.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/94454515034.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609414371c857---24787490974.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/mevebigurararisofuko.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/22042818383.pdfIn PDF document text
    • http://sakem.org/userfiles/files/53093179674.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/safegizagemogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=james+%40yahoo.com+%40hotmail.com+%40gmail.com+%40aol.com+txt+2021PDF 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_off0000bfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC0 16512 bytes
SHA-256: 0a04bad196556368ff65c1559b747cd2309727054380ef3a7bbc6455aca3e376
font_01_sfnt_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 11356 bytes
SHA-256: 638b2a7fd827d94f32b225e03257bbfeed2e4dfaf7bd87081abde11952a991c8
font_02_sfnt_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1