Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c03c93aa1e68e66…

MALICIOUS

PDF

101.8 KB Created: 2021-07-29 16:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 45033118d9b7673c583fff0c42a3e2bb SHA-1: 7f1f917e725911fa8dcc8f9625919b4f717e919f SHA-256: 9c03c93aa1e68e6683f81238cb2d1505f6b0f6772dd68068bf2930523fb99405
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://crysiq.ru/uplcv?utm_term=geometry+dash+apk+full+2.2 PDF link annotation
    • http://olgapolyakova.com/files/files/fexujuwirakurokegeguwe.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/nelore.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/mafijokaz.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/054b556db3bf97767fb25dd05b337eea/22384272600.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/tilim.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/pa444hm2nk15148ooop8lcvn9a/pawezakopirowesokiraxos.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jazuwuxof.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160764df173b7d---takavemixajipewinurija.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/fewubofomumos.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753e9258039---desekagifomedekaxorapep.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/98508639506.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/zosubofowatavi.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ll42hi2he5e7sbof9tdrr7kejk/gefuzebapofumevurapuwo.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/17b8613d28ee8373164ff6f370648185/51107674858.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0721dedvbe04rrntpo1gcst06c/75888993947.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/11130912069.pdfIn PDF document text
    • https://mmszke.hu/files/file/29459436214.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/19702467826.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/28961232808.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e0e8d5f580174a4381f8f43f08e35f49/sazimojosabuwudopaxanijig.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/4589886627.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/6cbbb94b90ceee463e2e1d4aecf5eace/42587577803.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBF 24812 bytes
SHA-256: 77b19c58f8396d8dff587910721b64713f45177e063818766d39123925fb0a05
font_01_sfnt_off00014b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B41 11100 bytes
SHA-256: d1a53dee066f723bd9440d006671ce77d78eed33dfaecb2181cac68d785bf94a
font_02_sfnt_off00016549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16549 2544 bytes
SHA-256: 96853dccd792535bfc410951c0911c1b73d6dc2355252a96aecd7322b4a97947
font_03_sfnt_off00017063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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