Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc8af0fde8dbf07…

MALICIOUS

PDF

94.0 KB Created: 2021-08-11 11:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8dfe5844dd5e0665ee7a7eba3f1a04d8 SHA-1: 51d6f5c37e73a861626f5c8970c16351f0815033 SHA-256: 1bc8af0fde8dbf0756c167d1b20fa27065244889ca71d931b207012dec7a3be7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

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://allytemp.ru/uplcv?utm_term=marvel+super+heroes+the+heroic+role-playing+game+pdf PDF link annotation
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/wofajimiboduda.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/59040759774.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/nenabekom.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/19607033889.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b95d74b873---87320125299.pdfIn PDF document text
    • http://dienmattroigiasi.com/uploads/files/393963900.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/p5adlomn0dd00hrq9cfdrn83i0/pomevonanutoxa.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3a7dae41---depaladubovararazinefapi.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/cec909d815c49f143c8ab9aa5f235193/zitidefofozad.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/vagodafejulugasiwenux.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/demasiruziwonezokemaban.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/wivapa.pdfIn PDF document text
    • https://sinarwaja.com/account/files/52386972365.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a7de3a8e---33038785678.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad7ca22fb9---66753401406.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5ad11c4033a468c486fef760ae98d67d/2723194626.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/rovuzi.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/nsq8cqthboim34b6tfe97rm6v6/37180637381.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/db4c09d9657e711d43fd51d9f7db0ef3/94363734933.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/nebolovevepokaso.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be9164be5f---litowubopapedidejakano.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/dotorekunesu.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/zebenedibomemen.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/931eb8f04e6d4a4c9db326ce9febc058/17776283221.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/vozefizesaza.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_off00010930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10930 11372 bytes
SHA-256: ae0c4fedc13c068b6104550c4a808114fe7063d929d452be2bd1843f1654c330
font_01_sfnt_off000123ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AC 17216 bytes
SHA-256: 247602d60a6b4a89f336ffe112c9e44f8b40463c94c0e637fc298808793a329a
font_02_sfnt_off000150c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1