Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb022be668cfb137…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 17:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ffebc000576bbd1332c3c110e08e59e SHA-1: d9f0f3f75c91050a7c8b30d8f811c0ce3db57e22 SHA-256: bb022be668cfb1377861592a592b5d0d8d50021501070b53708ab73419634a19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and disposable hosting, which are common tactics for distributing malware or conducting phishing campaigns. The embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=alcohol+and+belly+fat PDF link annotation
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/6i9lu30pd9m7787mbu5gs71n2q/neditedufuweboz.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b33426def---lojenoviferuzureri.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d83184d356---28882923863.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/53434822707.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/9qfeuuioe0sr1vh00vmebp7or0/70988108894.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/fb2b3b01b4efee7c8083e5a2d724bf72/42206429581.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/xalapabevibajeraduk.pdfIn PDF document text
    • http://packamate.com/userfiles/tegaruginonoleliloxeze.pdfIn PDF document text
    • http://bio86.fr/fichiers/vufirirunoralizenawojele.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/4e4cf2664d52b6b9bfa6bfae9917eeaf/kajik.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/1abv8buffqa86gv05dtuc6op2d/59603080619.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/833741837401fed8cc5f22e56637e9ee/newukenajiwowipobokofudut.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/farobelilaloramojeda.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/jajisarupinifab.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/34f2a03810507da50d24706530ab2397/buwaduzev.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9508a2f75da689c7d231667f5ffeaf16/lakimivurizemumelise.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610325b511269---62752198920.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be305c8f4ff---60949611211.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/dufesajupezotemudijojukan.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/biwomixetobi.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/8dd9cccec5d413eacd28b9e48d16eb32/22154018324.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612713aced9ec---fipepukur.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/36548293287.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/zuvanajutodekekomu.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_off0000ca38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA38 10448 bytes
SHA-256: da0f08f3028252769f083a8675187f018e990633cbfb80c42b01420e379169c6
font_01_sfnt_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 17372 bytes
SHA-256: 7d1ac60a6592de0028858f3ca774d3bc511c303dd58688d3d345e133e56de66f
font_02_sfnt_off00010eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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