Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e60b61fe669e01…

MALICIOUS

PDF

90.3 KB Created: 2021-07-01 14:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a61c9270af27ecc981f02f271d96040 SHA-1: 3ad2e28cd02eff96007496af668f1ceb510ef1bb SHA-256: a4e60b61fe669e013b75c1f2fef01cf3f3d1f27c6166838a9eb693de89c5b31d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. These URLs likely serve as a link farm, potentially redirecting users to phishing sites or malware downloads. The presence of these compromised links and the overall structure suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c069a999db4---samibijezinofiv.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6f2b2ea04---25529094154.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea70be9a39---pesunerevokidusifope.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6de0d8d1d---mekukoxosozekomexufajev.pdf
    • http://ge-mak.com/files/jeratagesizulesupuratexem.pdf
    • https://ktmcollege.org/public_html/userfiles/file/pawobuwu.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d43d7821ccbc799638c5fd7a62669b14/gifupaxoxagoxipemak.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/37142591143.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16090a70667813---zataman.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c84dd69c33f---92115079966.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b1fa872bb---89144792531.pdf
    • https://jerseyshorepirates.com/userfiles/files/45688411491.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/08977cc318d3983097514952b3f5069a/lomabifeworoven.pdf
    • http://ubest.ru/images/file/zenufabimulutafusomupi.pdf
    • http://cropscipublisher.com/files/upfiles/file/33817697938.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/4191894136095cdfcec2db.pdf
    • http://www.rify.us/cms-uploads/files/61393573771.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/0a45ad8f36fc236fe8186abd58b423fe/girisoju.pdf
    • http://mmbc.cz/_data/user_files/file/86802477920.pdf
    • http://rogersdesignhouse.com/uploads/files/98065206331.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/50a2bf373a4b70ae2d17dff4934a419c/wolofix.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/dukulivonitifen.pdf
    • http://31kouqiang.com/userfiles/file/1622676013.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=servlets+interview+questions+and+answers+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_off0000fcbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 16792 bytes
font_01_sfnt_off000114d0.bin
edee83b655c3789e288f40658dd2333106d479a092aac8ecd5856941c687cd58
pdf-font-stream PDF embedded font (sfnt) at offset 0x114D0 16864 bytes
font_02_sfnt_off00014070.bin
ad545ce1347cff57e1b2deae3602a1fd0b6ca2f223e738cf8bd1e5f1e7fd2caf
pdf-font-stream PDF embedded font (sfnt) at offset 0x14070 10964 bytes