Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fe3794e67a9100…

MALICIOUS

PDF

86.0 KB Created: 2021-06-30 21:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e81af61e2e5c6b4b126ecf6ba2bf77ee SHA-1: 57a422075d075ded476cad65d3c510c746a2e25d SHA-256: a8fe3794e67a9100486da4e88393d8518cd54ce188f99332dd062a3777cd0b7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/e286e44ea56a570698dc225f48dca39f/jiwit.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898be0ce8e7---26835536745.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/7c9e802880f7af2e8e06b7d08d2d5cdf/21334526826.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c81d0f442---gefikab.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71174ebcd---gonuboweselu.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/pijojaporijodulano.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/a20a4484159fc0242a9c1597fd2dbcf0/rijofijupuzeru.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/bqqmlqto9icq9ed9bn26fjj0mp/wofinalixopabumezorego.pdf
    • http://www.jindatunnel.com/up_files/file/xonalix.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/h28hkg2evmdcnooaotn81tluq9/zowakufukerirabibad.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee84294cdb---sefudoxedobajizemew.pdf
    • http://bigxra.com/uploadfile/file/2021060200451873499.pdf
    • https://anukulagrotech.com/userfiles/file/27613770794.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a13bf785c286f5d0682818fa66f27b7/90900275441.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848cfb4d9c4---wifurepuvilizagaloniko.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/380fe391e493b3b480d289286edcb4c2/98206007292.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09215b013d---34685228954.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af8da36c843---74898278919.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/7jugevkdgk1de8rlkog3a57lae/25947607032.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d35031aff1---51181599943.pdf
    • https://villadorottya.hu/uploads/frontend/files/zorufakivapi.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ebf1q9rjrag7798kgc0c457ac2/lubigajolujeleseg.pdf
    • http://hayatteknoloji.com/webimage/file/31630124801.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=songs+with+drum+beats
    • 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_off0000ec05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 16792 bytes
font_01_sfnt_off00010417.bin
ab67783175d40cda0742b9ad1a65ca4e50b5dce712eceb990c4071d1f75d9d36
pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 17360 bytes
font_02_sfnt_off0001319e.bin
08ba08adf9ada972c768c246e0370ed67466ad1e2039db3c9a2d2ca47e46c62f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1319E 11052 bytes