Malicious PDF — malware analysis report

Static analysis result for SHA-256 5208b998b73645ae…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 05:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63c903a5e762b29d91f641e4d945dd71 SHA-1: 312674fb552af317d12708d2dc9cb7d8bf1a657b SHA-256: 5208b998b73645ae7b484bb3f13e9f247afda16362cf5ef8bb6e53d2b1476b0e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external links and the nature of the hosting suggest an attempt to obscure the ultimate destination or to leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://philabc.ru/uplcv?utm_term=meme+quotes+tagalog PDF link annotation
    • https://xosobacninh.vn/webroot/img/files/veboraxijowarefilabo.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/21796089779.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/lidafemogawaxamudapeloba.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/14721473837.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/batezoxazimotomiruzukawid.pdfIn PDF document text
    • https://polytex.de/sites/default/files/rojikukekeze.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/tukegisazegavi.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210916090637.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc9ddbba3---46742977677.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/fakarapakuxo.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/46721885746.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/42646585893.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/94622973086.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/72048c273b30deec168ff6145c55be21/76274558526.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/62797728832.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/demumanovofupomifo.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/71658108772.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/68182027347.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/19494729497.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/57036405195.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5f5957c1d---bezuginosagifo.pdfIn PDF document text
    • https://fasaac.org/temp/files/gumisoxetibarin.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_off0000be1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD631 16904 bytes
SHA-256: 350f76be7f4bde678b746b39cb76222909bc92432d4d9311ece3c3b65f126999
font_02_sfnt_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 10392 bytes
SHA-256: b9be1d52b875de5152489b585dae8a4d8c23f11fef0db7e053d878c05d67c931