Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4be06c4633bef52…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 23:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4fa3eae26648b96add493634aeafac8a SHA-1: c186ea1105cefd9af5770418ee93297383da9c39 SHA-256: f4be06c4633bef525d66672068fcfb424942e50875ae7f16ee1047d877290131
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No specific script functionality was clearly discernible due to potential obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=les+outils+de+pilotage+d%27un+projet+pdf PDF link annotation
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/9fa10205fa2e7b7b8215cfe9b168d1a4/68588249239.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/telutogijimexuxilanamav.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bc2967507---vitatiz.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/pofelinitizeze.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161290d7de265f---61529894535.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/h2aqajdi2bmmvq6eukk0s2fspq/xibutudonesiketokixoz.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb8920b6e---gazepigokewumupimexij.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1f0f15r3llpvlr7073r06qrgk4/jitati.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8724316652.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/ginopodometidigalovuwamu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/naniji.pdfIn PDF document text
    • https://parkettworld.com/upload/files/kutizaw.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54c787294a---fesudoxepo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6e506a28aef34b200824afe49800762e/safumiviwuj.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/gumenubudodabufesizunoto.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/jimuxajifizukisavoler.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/61864738690.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/57d342e1c94de8acc70aef2d6380850d/80554707093.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/veravij.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8974475f3---47113309826.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/bafipuzikuxajuzutotan.pdfIn PDF document text
    • http://steinemann-ag.ru/49146511541.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c768c635bb---vuvebofotulogaganiru.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c1179dcc55e8a997685ec2e6f453872a/goxonidonuker.pdfIn PDF document text
    • 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_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 19616 bytes
SHA-256: 4128178631de40e8e9a89023e8e913ce4dc0c11b6234b8f11e34f391c6ad37c1
font_01_sfnt_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 10892 bytes
SHA-256: 55f55a23ce20e5177bd5de2e6ef0a29279ca0f52130d2c5cf1f4465da76426f2
font_02_sfnt_off00012b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1