Malicious PDF — malware analysis report

Static analysis result for SHA-256 8391e772b984dcfc…

MALICIOUS

PDF

87.1 KB Created: 2021-06-28 23:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2026a66cb25882f11d906025a02db691 SHA-1: 179a2f6f2a0c721f33c00f14b6b89ccda1f1b282 SHA-256: 8391e772b984dcfc859c21d0897f17bb154bb57e3a19f153fb5e2755617db46f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and the 'link farm' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6551c4cc103739803d9c251eda661710/xovegawirovikozo.pdf
    • http://wowbond.com/upload/Fckeditor/file/22714012968.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb2385a77b---97819223109.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/7a7077f5b4cc6e0df66e65cb58d28bec/pamusutinap.pdf
    • http://provia-events.de/pics/fotos/1/file/62736453089.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-4-30/20210430043113339419.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d5e641fd8---80734173272.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fbdq8ka9v6mpves02a2119893m/17914165989.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ab4a5bc201cbbd966853dca0b2740101/29617089428.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f9d74d895baf3b770a2d4da1f08ee01f/rawoxosugowirizivu.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923a72bd708---85687224876.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/har12hnp0a70gj86m35k5ah716/mamaxixomojufaxavi.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/5heu3bnjcecqsk190a187etair/52931353551.pdf
    • http://aldo-ins.com/userfiles/file/34524021003.pdf
    • http://bagiez.com/userfiles/file/95656543817.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c5e8421052082b04496917ede1ded7f6/25719491257.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/i3l7imrbm2ni0ahp39q6m42go5/74478685639.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b5120f327---3044955323.pdf
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/xozevegijogelalabufifinot.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/widodifarede.pdf
    • http://adamlegal.com/userfiles/file/teferalamorabevopuxeveli.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ckbmk6b6v83g49bedltqfcvs9f/14593627260.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9177c684c---20633550530.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=windows+7+mcq+questions+and+answers+pdf
    • 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_off0000f031.bin
4931d16089287e015d60f6963cc2fd4e5ee1990a56a4a880522d0e06edd5664e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 17128 bytes
font_01_sfnt_off00011cda.bin
14c0486d1f4b02c69eb0781b4ab2ff7c893eda84f933a6afedabaf7ecbb36866
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 11112 bytes
font_02_sfnt_off000136ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136AE 16792 bytes