Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c94a0b65976c43f…

MALICIOUS

PDF

75.2 KB Created: 2021-09-13 22:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 251f206629ed4514a538d6d49dbf173d SHA-1: 12dea50105cc134aebc87855e523efd366bbcc45 SHA-256: 6c94a0b65976c43ffcc38c5c0d43d7aa56a8442fda5af89d008fe1b335935b09
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. These links likely serve as lures for phishing or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://wastran.ru/uplcv?utm_term=2+line+shayari PDF link annotation
    • https://kop-trans.pl/uploads/userfiles/files/lajifumar.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/32068911627.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/64191681821.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/76496097996.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/dafozokefefazitof.pdfIn PDF document text
    • http://iscelenie.info/files/file/80499136200.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///53703042541.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/90762261752.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/labodiwidisikenuvirota.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/bivewovevofa.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/supasofavowakorume.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/purenuxapitatugovekuf.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/felemadazezazam.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613794677a12d---tusagegenogur.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/77786022485.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/tofenoke.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/86830633290.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372413227bd---xaviluzo.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/952dd0d15eff64d17cc3e27b6f9caa81/32883779251.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130348701646---zoxidon.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/duwozafawiruduxa.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/86763843270.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/19f4d5950321c7f7dce9f9c448699861/43735269015.pdfIn PDF document text
    • 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_off0000bce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FF 10124 bytes
SHA-256: 544b8f154c4bbd793f9caa7a67a3a725c7dc7c4208865f4dd7fd9905dcf6fd04
font_02_sfnt_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 19960 bytes
SHA-256: 32b0da841a00684f5a3557ad15e946fc33b2bdd2fb34297f06f3089f38ecfa72