Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d821356d0a9261b…

MALICIOUS

PDF

67.6 KB Created: 2021-10-03 22:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8648b7a4fe88b051bcb1320a69a59ba9 SHA-1: 997c88cf065c25625115ba49d5f77e35450ce959 SHA-256: 8d821356d0a9261bcc3bfa2d34d259e7d1bd3ca5b610855db1563fe7dd1c6f38
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including an image-only presentation and embedded links to external sites. Heuristics indicate it's a link farm on disposable hosting, likely intended to redirect users to malicious content or downloads. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nomylo.ru/uplcv?utm_term=wwe+2k20+game+download+for+android+obb PDF link annotation
    • https://stl-log.com/htdocs/cljr/data/files/sibipizafikukabonijalo.pdfIn PDF document text
    • https://imperialbroker.it/userfiles/file/ralawuladezadixitetiraj.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/80451889510.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75013471165.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/dejane.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/39928014768.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/repolazetarepo.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/givefavupupetedu.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/11789383707.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/72578ad8b5f5fbec5e3190c47d235c34/68851746409.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/0618dc8024a2699d4807a1a801f3a5c6/13795993283.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/70122164737.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/62351627801.pdfIn PDF document text
    • http://praguetransfer.com/files/file/52743389909.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/filowitonixidevavi.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/c4f18a361b893f0fd5786e446b91026b/xasoraf.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3a5dd653---mexatun.pdfIn PDF document text
    • https://crawfordpoint-ca.seeninherd.com/files/57816335221.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfc96ad712---merazu.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/lumisitivasixeje.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090911263573499.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_off0000aa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AF 13932 bytes
SHA-256: 4fefd377e71d091206cf52c7cfdc356550b0005980db96e50bb1cd122b7feabc
font_02_sfnt_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 10984 bytes
SHA-256: b73d93f01e1262639e605cd95a92c2583aa247c63da0acce8d6f2c1bb0c3e396

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