Malicious PDF — malware analysis report

Static analysis result for SHA-256 064241c1875f5f2c…

MALICIOUS

PDF

83.7 KB Created: 2021-06-25 12:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9538ddd3b3c625065d9c7cceafd5bfb4 SHA-1: eb7a3396ec675643718e8742d506b35b73983712 SHA-256: 064241c1875f5f2c2ef937969d63ccdc76c6a74a3b82e4be5c2f5a5a3f788b98
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on domains identified as disposable or potentially compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ost-fogging.com/upload/files/woker.pdf In PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/mgpuf06uk4qhli3qch0fmc1ql2/zorasar.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/bojasalerufakixefov.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/jupovuwude.pdfIn PDF document text
    • http://derma-dts.de/files/file/vexov.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/75338084599.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075b3c19573a---99642514680.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/geljmcqinn8h50u3e96la3oeh5/43831919664.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/34224550670.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/6596d74478308929ca7821e572db975f/vonakivuzodezel.pdfIn PDF document text
    • http://azizolace.cz/images/file/tobavesavoga.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/68854509301.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/e881c0e3dc183a69cc6d8cc9c744270d/matumibadapimufoniloma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+you+repair+a+damaged+pdf+filePDF 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_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 10760 bytes
SHA-256: 3fee2d3a72c22c7a905f636ae3cfabfe27f9da269d79c8bcba4a9b145790e7f8
font_02_sfnt_off000114cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 17260 bytes
SHA-256: 78633060e1b1e0d57f76f97c7803f4a928f54423149677ae522497bdd9b43a80

Open this report in the interactive analyzer, or submit your own file for analysis.