Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d35366f1dcba19…

MALICIOUS

PDF

88.6 KB Created: 2021-07-03 16:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0491bfb775e496310b16d0025b751309 SHA-1: 34b8ae7c2c4926b4930a27e83d52bc7cf93df17c SHA-256: b7d35366f1dcba19c40be5b9e1204d7b249875d42cab77b85a76c005b7ed08dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites, many of which are hosting further PDF files. The primary goal appears to be redirecting users to these compromised sites, likely for phishing or to serve additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=what+do+leopard+frogs+eat+in+captivity
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba72a9b3b0---49450903469.pdf
    • https://goodluckfishing.com/ckfinder/userfiles/files/wazetuzimabin.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5435a4d87b---xujuf.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/53rrpanbktf8euiipghikh14p3/92622602503.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b1a4807a5b2bbbd31c6ea5f79dce2088/desug.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4f2c7c4d3---wopifuwumojezurinifa.pdf
    • http://cloverpark1959.com/clients/51168/File/2059201280.pdf
    • http://coming-c.com/userfiles/file/faxiridugiso.pdf
    • http://championsview.net/userimages/vofoviposodulox.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/60254018124.pdf
    • http://balone.net/_upload/file///sirise.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608254ad31674---dosomerozokajimo.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/d974cae399fbc40ca791e4ca806893c1/562475404.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aa81e791078---90227180698.pdf
    • http://scoutpate.com/userfiles/file/nawusefaposumamafarowal.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16094e15ef3e50---murotuvopowakatep.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0ac8946c5fea2fa7bc7d06804b125eab/wapisikuvijumogezisutaz.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/92c38de1c45b464adc7ef40e8a1435c8/36440256872.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdebf937e54---xulimepilafiki.pdf
    • https://ags-car.com/upload/files/jenomilumemelebinilin.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/m273qv4d1v9filbu0iteslpobm/53628480745.pdf
    • http://bpsstudio.hu/uploads/67099905422.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5db03157d6---sofuvobemanawusojotupeson.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ae.bin
d7ac5097eee8245d4a459cbacb07b97467170d3b887aa5f4f9b0d05431b8518c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 17428 bytes
font_01_sfnt_off00012353.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12353 16792 bytes
font_02_sfnt_off00013b6a.bin
df1eee448ec07c6676be72a207f11cf20f5b4dba3613834fe8c545714f70ae74
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6A 11072 bytes