Malicious PDF — malware analysis report

Static analysis result for SHA-256 812d697d2d1b7519…

MALICIOUS

PDF

66.3 KB Created: 2021-09-25 23:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d19ba1db7a8ea1f589f952f39389529 SHA-1: ce9c2d3db05a21667e54fa9a240326319f185487 SHA-256: 812d697d2d1b751958bb704c4160388632bbe92c467783ce2661150d970fc447
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier. It functions as an image-only lure, typical of phishing, with embedded links pointing to various domains, some of which appear to be compromised WordPress uploads. The primary link suggests a lure related to gaining root access on Android, indicating a potential phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 66 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://inwebjor.ru/uplcv?utm_term=how+to+get+root+access+without+rooting+android PDF link annotation
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43453361136.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/21155212273.pdfIn PDF document text
    • http://debten.net/UserFiles/File/goroja.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/zirivenapesetorifan.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210909200017.pdfIn PDF document text
    • http://gabortech.com/admin/file/55741942038.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/16279289077.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/31bd6f189bf3e362148a1822dc905da2/24677915028.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/zegomewavajaxosifimotige.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/jitosebimafajulopoxoluf.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/pakasipefureb.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9d03433c---sufizepuxubuxo.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/venubupotopenanale.pdfIn PDF document text
    • http://coumert.com/images/file/dubamuvanag.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/fupoj.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/61730486323.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/rosibo.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/kesabubalekijifigixa.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_off0000a7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7C7 14188 bytes
SHA-256: 580145eaf7a742943109e82bd072fd71a830e47911f76a7eb96759e59b33cdb2
font_01_sfnt_off0000cb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33D 10780 bytes
SHA-256: 8d008426c25633f6df077edaa29647e997fc3f411cb99cd8245d6aded5895275