Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa1642294ccae52…

MALICIOUS

PDF

78.0 KB Created: 2021-09-06 00:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c06a83713495d1031a272a3482490f48 SHA-1: 9a763968014f2fde7eb7162ca9a74beacde0abe6 SHA-256: 0fa1642294ccae52650d026ebff16e53a75ee0d85093a43981a82e527d1db24b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple URLs, some hosted on potentially compromised WordPress sites, designed to trick users into downloading further malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to deliver a second-stage payload, likely via a malicious link disguised as a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://balajitutorial.com/admin/userfiles/file/9772868436.pdf
    • http://abogarestudio.com/userfiles/file/78799858933.pdf
    • http://www.beautyvogue.ch/Files/file/28367189400.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160830e4c0a5b8---pubazirejujoveroviresum.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/09e4499fdc8aed663d2098d18a18b145/27447978385.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608552d579969---58398411659.pdf
    • http://ampletrekking.com/userfiles/file/zijakiwowagonavutodebid.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b81196af08b---69772215271.pdf
    • https://danielstrehlau.com/userfiles/file/85141839286.pdf
    • http://marcelponjee.nl/ponjeefiles/file/tusozatipaluw.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0a2a95729cd9904fb3f68188a163c7a2/69759984861.pdf
    • http://ttc-investco.com/img/files/mivugejupol.pdf
    • http://bogelaipigeon.com/upload/file/15981589615.pdf
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/patulawalobufe.pdf
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/lariwuniz.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072093bad3f7---94884078358.pdf
    • http://caratow.eu/userfiles/file/81941142224.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609406f5a9b31---21864987148.pdf
    • http://modellszerviz.hu/userfiles/file/zikaneteredu.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dafab847a68---juketofonerojelamogetir.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/651befc1e76ab6f08e5b2f916d13fcf9/sivagib.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c322c598184---numexe.pdf
    • http://crabandclaw.com/uploads/files/43851695462.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160756e1330334---sazikowunamuxedomesu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=canon+eos+rebel+xs+user+manual
    • 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_off0000cb9e.bin
8115e89ab446fdc3f331876a7f94e5f6a2ed2ae9860ed78b63a20272ea3eccce
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9E 18124 bytes
font_01_sfnt_off0000fad3.bin
2b6fc454f4e24e2c30d71bd8350ad019d1c8e883d69c759731bf8754bbabe9ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 10452 bytes
font_02_sfnt_off00011299.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11299 16792 bytes