Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40f0cbe57df5844…

MALICIOUS

PDF

75.7 KB Created: 2021-08-29 21:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d2a4f52b67cbe6a4d77664a14c950327 SHA-1: 9831c01de3efc813f4249fcd05ccb1fe280f7fad SHA-256: e40f0cbe57df5844b48954cff3efc46aefc228ee12711383ecf6af7afae73210
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pistant.ru/uplcv?utm_term=the+last+supper+painting+tintoretto PDF link annotation
    • http://bettynblue.com/upload/fck_img/20210508/file/neroz.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210719_E900A0F0A051CDF4.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/70838297603.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/500aa5fa9fca8a881300c757b4cfd175/lezisususakokavonijize.pdfIn PDF document text
    • http://sciattella.net/images/file/39289116282.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/n4sct2rv5u38cs377a18ve9l74/mofawejazeludezakawoti.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/513844905c5d775b4825af7871aaf0cc/mizafix.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6c295bea5e3e3ffc0c40fb9395322327/gukudabegoraf.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/330a26b8f27af3be99fc4813523084c9/22705736359.pdfIn PDF document text
    • https://oversaslogistica.it/file/68307175156.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/zadufidebibif.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/99397479828.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bea9aec05be---80634184681.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a140cbc7111---16580546063.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5600728719---vesuxasujizekanasizavek.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/70082293078.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/290034a11dbb8e63fe22be9655bf9523/tumufekepenofafeba.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/87114394929.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eadb0dfd91---12638166283.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1c9b0134---98838031276.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/kotirataxazef.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/gorenixovimemelav.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/87032418441.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_off0000c1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EA 17100 bytes
SHA-256: 21ab16e98d7ad80ed6261611ecd37fe8d98091bc7cbacf13ed75259e8791eb0e
font_01_sfnt_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 10596 bytes
SHA-256: 0a20aa1e8087fa5eb72bdc1a5c11f875e32f9af03c3cb3a8a849046fd26adfad
font_02_sfnt_off00010717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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