Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1e89ecc8e0c21d…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 12:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ef7e96ed33638c96a1d01f554b964f3e SHA-1: 5f7a024b43ed918637e07b3577b75b2874fcec49 SHA-256: 0f1e89ecc8e0c21de237f949d904ea67507d326aa766716855fc7e6f9cbfe092
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It employs an image-only lure, typical of phishing, to entice users to click on embedded links. These links point to compromised CMS uploads and disposable hosting, suggesting a multi-stage attack designed to deliver further payloads or redirect to malicious sites. Embedded JavaScript streams are also present, indicating potential for client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=get+smart+brian+tracy+pdf PDF link annotation
    • http://www.patriarca-batiment.com/ressource/site-image/files/vunuzopitixasulagog.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/43015819219.pdfIn PDF document text
    • http://handgun.ee/media/file/vekarome.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/59357095702.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/lazunitapinogumuvinevi.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/44467857483.pdfIn PDF document text
    • http://sb-78.ru/files/file/83537036158.pdfIn PDF document text
    • http://safarang.com/basefile/files/20939082295.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/jokisalupifibuwilanube.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/zoxedajakimixatixipobi.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/mujugimibiluvudupowe.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/vimotitibirazuwig.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/tisevisaxozadupigozufasit.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/8595075093.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161452563ab071---tamofefika.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/14029510376.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/96542863017.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/bisaruzofupuxifo.pdfIn PDF document text
    • https://o-dance.com/upload/files/lisekuwimabeta.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145406ba2f3c---27638829448.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/95735193579.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/sogunupijupogajagomajugal.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9add1b20d---kozovezijabo.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/10377313558.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_off0000aee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FA 14372 bytes
SHA-256: 18b332c9269ad79add0633a3dea3683936d517ba1377f3fd6cf0ed8eda01f3a3
font_02_sfnt_off0000eb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 10908 bytes
SHA-256: 4c5ed6fb16459e5d523b2a7a2b7aefcf617660379cfa6fe593ab6af92568a460

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