Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38c661b92b1760d…

MALICIOUS

PDF

81.1 KB Created: 2021-07-15 09:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5802d6d36d0da8d456bf0aab288b8f22 SHA-1: dd1610f08b94d711e18a268cc4d05f03ebdc0dd9 SHA-256: c38c661b92b1760d33c65aba401e4521641829f39e8c406b0f4d451095a71a70
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm designed to direct users to potentially malicious websites. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with numerous unknown reputation URLs, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/bodimobitivaki.pdf In PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/qso2fgd0gbfkk0hgih9ro3oil3/wewoxidime.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/23898217594.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/spbfm3co5f1a9mm8naj7igfasu/xodasetosifuga.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/bisoxidijalomepivibefevu.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/71907268984.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/dovivejalosenepasitil.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/68823949151.pdfIn PDF document text
    • https://ka-base.no/images_students/files/faruladusokipep.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8e38cbb0---nazuneropaje.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/5a0df77b349834179a130e75793a15a1/liromadawimexi.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f18b23c71---72410045316.pdfIn PDF document text
    • http://benefielddarrenfordhicksunited.com/clients/2/21/2186b72972973349411f8b90e6071e14/File/jopixidaju.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8253e1afa---wodonoxoropuzodasiwele.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607448829c5a8---7437785280.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/81788450881.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/vetugemokeg.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/m7ikm592kp83raumnbjo106444/52343800897.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/2gf6c1icf3ibvso2io2o5fl661/lobodotoxewirekel.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/12022864910.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6fffcf3426470150146e1203da17741f/vesusujugawepupapelabif.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/waxusibij.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa2a820770---fosurugizenom.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/88277599498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+consumer+ombudsmanPDF 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_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 17392 bytes
SHA-256: 8b8b2b4cc4df32fc9b8b9b73e9738ee6324c0ed4b5b7a7b532ea94a2d08375e0
font_02_sfnt_off00011f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F43 10600 bytes
SHA-256: 1e4005ba205d906b3fa253c9b0106260c2f114ead7740e389ded895d2e63e52f