Malicious PDF — malware analysis report

Static analysis result for SHA-256 709dc7d480c6f707…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 13:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 85d866608fd4fe2a9096242b454ec1a9 SHA-1: a8b5d117cb0fdc29ae7c738973752bbb0397a518 SHA-256: 709dc7d480c6f70796dd7cbdb45bfee68ca01f7f7d97225fdfa2859686e8f36b
204 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a password-protected archive. The embedded JavaScript stream and the ClamAV detection further indicate malicious intent. The primary goal appears to be a password-protected archive handoff, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.pirac.org/wp-content/plugins/super-forms/uploads/php/files/79749dc384598f777e9b19f6a8976590/wesifibif.pdf In PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/genofegoduje.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/10678560445.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/3rakjbjtfphun7p1qhjdphcq91/vipejekatuzulepino.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/jodirumowaz.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/69611340193.pdfIn PDF document text
    • http://bwc.lt/i/4803448487.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/49307457040.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/zififav.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/44268333815.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb595bd9cb9---59421604536.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/91enaoeikgnbni92tlc1qe1dim/xixumilumevigepujalafob.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/gepas2n8eb5cpoc65neljqde52/3134835224.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/vulolonefotebinekifapa.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/torotenuxurozixeliv.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f01ecff43801c8b908729ddb63bc0e2f/gelipurugovunifadarapu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/4e25e63e567ecaed2d6126cc9f8477b7/70860086054.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4909cfc6---10545291206.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/53426157018.pdfIn PDF document text
    • https://comfort8889.com/upload/files/pawasikebubezunera.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad88c43d630---ruseguzenugiwemat.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/0j9qtcp2nn9v7c8p5ja0oum3l2/lawuvugi.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be3374574f---mudikowepefeg.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210819234632725363dd28mtiizddg.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8403b2f2e2e2ef582300c380ae01e74f/35770510837.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/vatulesukalasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=merge+pdf+files+windows+10+freePDF 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_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 10664 bytes
SHA-256: e98540479be13b9d291fc0ac364f77dfc521b1ac7d1fef02c89a667c1a090012
font_01_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 17640 bytes
SHA-256: 5c1ef87a7db798f2751fedcce336b527b9d2e6a3655a880fb7ce7f8b8adf58bd
font_02_sfnt_off00011f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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