Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc8aedbb571509b…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 04:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7e2c37c284004daa342276acfca4eb77 SHA-1: 77ad0e9098102af64311db09283187d35425a9a4 SHA-256: adc8aedbb571509b7923f173dbf6ab0702cbd6364b564deb3ca5e21cddacbe40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous unknown domains, suggesting an attempt to direct users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://jysfh.com/upload_fck/file/2021-9-5/20210905223509196108.pdf In PDF document text
    • http://cestovni-postylka.eu/userfiles/file/58681022533.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/gutakesopiligu.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/61216273677.pdfIn PDF document text
    • http://fnathservices.com/upload/file/vunoxerowidiraguwi.pdfIn PDF document text
    • http://cascad-trans.ru/files/42048600940.pdfIn PDF document text
    • https://htchninc.com/d/files/50165954654.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/42927061829.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356b03737a5---xosifolabamuginevorived.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/soguxoronavolifuximu.pdfIn PDF document text
    • https://asi-filter.pl/files/file/masifozebefoperutewesopi.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342a5b354de---roniwi.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/45332927542.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/dezuv.pdfIn PDF document text
    • http://co-mit.com/uploads/files/24229152720.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4trgvo55ns4jknofh7ju10gsre/22928116348.pdfIn PDF document text
    • http://polipack.ru/content/file/setefanabukozozina.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d59d8425c---79290488889.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c1e86b088---32200108258.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/lepagifebenaradudopegadu.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/80078195098.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/13438112528.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/30466860838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=extension+bin+androidPDF 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_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 10420 bytes
SHA-256: f806beec08ab6b0cbff54dd2bfab81c69f08f9cb43999d29d866ca0415875e76
font_02_sfnt_off000114c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C5 19828 bytes
SHA-256: bd3bc3706eb6f34b26003dda87206b64ca1d2f1fd243640c9c34f31411f246f6

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