Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a98a3d60f7fa4c8…

MALICIOUS

PDF

82.7 KB Created: 2021-06-25 15:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4da6fec125dd4c41bb6c44a5874dc1e SHA-1: e38a0427d9e1df62d7ec99797fdbd73ab7eabddf SHA-256: 8a98a3d60f7fa4c8625130b062a7fdda85064ed33712cf2e92595416b3f7a947
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely to host malicious content or facilitate further exploitation. The presence of these links suggests an attempt to lure users to malicious domains, aligning with phishing and exploitation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/af5ba0488b3370e2b0966c7617ad95c0/mavavosokezonegelixog.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ci4ifep5p6bohslmq4iqt3qutk/fanezitudejesorotase.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/67b85ffa9750a238d165a763505f232f/75375457439.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/sja0gudmtiqbjd350ekn9bpe2g/7621714169.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/11d2fd0cce66954e06d6bc4c055221d0/52633216502.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607a076ce932b---jafumajimobivozagefe.pdf
    • http://oaklandscreche.ie/userfiles/files/98411666022.pdf
    • http://sevenseahotel.com/uploads/images/files/mibuvedutet.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/72694125089.pdf
    • http://cl-pub.com/files/files/dubisudobufimuduweselivug.pdf
    • http://axiomestates.com/userfiles/file/83532977531.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ina18rbop7j4md4m3er6ls8nu7/13003220050.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2fa814160---64830690302.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c69d73eab47---tazolevovijomexe.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d7d88e3bf---53559561921.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/cfae360c50def3116df6139d44d09ae0/65165571176.pdf
    • http://forumcutuca.com/ckfinder/userfiles/files/41355628995.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/c2f1c09e5bac514a331ae26eb45f838a/18572493512.pdf
    • http://nomaquito-travel.com/editor-images/6713042217.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=short+hairstyles+for+plus+size+over+40
    • 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_off0000e132.bin
2dfd823ce617745c00d9a931a08c9b55c3c1dd301872246e115f6b8cbfce75e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE132 10968 bytes
font_01_sfnt_off0000fae2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 16792 bytes
font_02_sfnt_off000112f4.bin
0727090e3c323988437dea4e4922aebaf4f3a8431517b2e6bd761f0687a5dcc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 16616 bytes