Malicious PDF — malware analysis report

Static analysis result for SHA-256 d113ff4f19027bac…

MALICIOUS

PDF

83.2 KB Created: 2021-07-30 23:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1defe076afe3fc235a0faca7ec1ec913 SHA-1: 3e38c4bbb0b20d278c63f25ad84f3d51fb86c5d6 SHA-256: d113ff4f19027bacac3b288938745024bc46a90e9a9ce9d9176367e24e000e7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm for SEO poisoning or phishing. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=solucionario+biolog%C3%ADa+y+geolog%C3%ADa+4+eso+sm+santillana+pdf PDF link annotation
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160878cf7e75b6---24005446766.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/7998744775.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/makuvifelujosatamobabadep.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914bbc76a8f---93957278049.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb1618b374---risodo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606d373f29f46---82987689865.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/7576035842.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/c046295d35469e0a006799dc6fd5dddc/kasarogofixoxufot.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/a1249c35fd7722b48a32bc8e644fc74d/fabuwivuloviwoxugorefofa.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/49166235495.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/35d449cb9403f0963ed30755277e6bf1/geseguneduwewopilivitale.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45c3153337---26496535186.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/vebilowikelawipu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/68e6ae48db4463a28e6cf7240b0c5b63/nevifijujuzav.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf3ee87e0---gujodutedojenuzufawape.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/29943427486.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/93828571842.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/570521e55eea0613a6361ca27a7f6547/56767130809.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/jidafeb.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/lukapamabidapowarasade.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_off0000d903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 11532 bytes
SHA-256: b4e84d2dc5e3a45ffe1aa98632e8fdce5b929287870ca52b79989afcd87b3afd
font_02_sfnt_off00010c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C07 18376 bytes
SHA-256: ab3313f7ada251e2ad0d9985dc21e8026dbc5319c7d9a9cbc08eb95d88f27df2

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