Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6619c7f33e76b8…

MALICIOUS

PDF

84.6 KB Created: 2021-09-20 16:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 82f815c1a2307a075fd1994ffb576670 SHA-1: 264c7b1c0537584112fa9eb4a1fdac089d2ae984 SHA-256: ab6619c7f33e76b850a8a66a9c1db233ef0c305a0af19554af1456d5718073a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating a deliberate attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garraldaarquitectura.com/garralda_userfiles/files/88797299233.pdf In PDF document text
    • https://digireg.si/upload/xifopitejupoxi.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/32470073395.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/duxuvotipupofogo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614118a306288---79985427746.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/j8jcedh6oo7tfldi8eposb5ab7/39721828834.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613470461fef4---rakusajilub.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/22844041461.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/magitelonof.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/xupakoba.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c6697c1211f58cdcc2ae1b7eb21fd728/127456805.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/7532147383.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/mebotowakopanafixufal.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f384123c33dd82f93ac1dcb384dfb185/72977230127.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/lasedunonen.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/kiwabativumewajavimawel.pdfIn PDF document text
    • http://creationart.hu/files/file/kozasukizen.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142eed5dab70---8754047070.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/55650838617.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/pusazimajovawagi.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/11525239045.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/22677118091.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/52231842001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ben+hur+pdfPDF 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_off0000e70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 18664 bytes
SHA-256: 12d3e6463c5431d7873d182aaf5eb1dadfe466a0039a38ff1d9881342dd40822
font_02_sfnt_off00012f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F51 10060 bytes
SHA-256: f0e6a0142a9f6dcf14ad28d308b3f6a911001da3888f10f61a150b036d529d5f

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