Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a12ee5887d0807c…

MALICIOUS

PDF

68.4 KB Created: 2021-09-03 21:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe8ed67148c3a8d8eee230dc1b91c855 SHA-1: 102edf96a2a19d9f16341fd3325bfe479ad54ee4 SHA-256: 6a12ee5887d0807c24c091293e262b19d482970c615ae0d2bcd70938ba032059
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as a phishing lure, containing numerous links to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing detailed analysis of its specific payload, but the overall structure points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 68 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 http://ural-resyrs.ru/data/file/navalowi.pdf In PDF document text
    • https://marathonblainville.com/userfiles/files/sugezema.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/ketod.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/vuluresodivubaron.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/xupona.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5190d9d9132cf926770dfa76178484b6/wufomonegel.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/daratilejenit.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/38250556029.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/62585836523.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16291235350773.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f1e9fa28146---50999576742.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/c6e7626118322a105e6b179539e9c3f4/80012915691.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/28275785284.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/13ca7c66708822be5673ff750e57a0c3/27229880312.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/78868184954.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adabf8cea2c---74413895816.pdfIn PDF document text
    • http://shamayachts.com/upload/file/58131055046.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/98360022293.pdfIn PDF document text
    • http://ippon.lv/uploads/File/najured.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d1ea49fbf1c4c539ec106d9a01aa5a33/26971347486.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/75897168386.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/19818635916.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/715f9b2d050b141aeeba96553083dfa8/tagodade.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff39404fa7---wekajoseledizanukup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=kaufvertrag+auto+privat+muster+pdfPDF 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_off0000b068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB068 10848 bytes
SHA-256: f2fbc80ae29972c2020034b248850a12541e75eac8f3235fc06ba95e63906639
font_01_sfnt_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 13760 bytes
SHA-256: 8f9c703f04a43466afc3313e321c3fc1b4aeb13c3f7f9fc69a4b4d50ec1d44dd
font_02_sfnt_off0000ea5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1