Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d19a162c4eab29…

MALICIOUS

PDF

95.9 KB Created: 2021-10-08 15:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 666788aefba80ddca0a4b246985d60ba SHA-1: cf0ca5640423cc3b150015f7c912c4fed1879f33 SHA-256: 15d19a162c4eab290286c23561039be2fb0b28d473625429281d736fb5961dd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external URLs hosted on potentially compromised or disposable domains. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wastran.ru/uplcv?utm_term=the+spix+macaw PDF link annotation
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/jukodizirovul.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/kogurijuvi.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/iivnv8q66rvf80dpgnb2rrd94v/xawokezelug.pdfIn PDF document text
    • http://state-lithium.com/upload/files/mununajanezifalaxutilep.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcdaf3f878---topedizorufikokoloj.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147154ed1ce0---13365329809.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2a2ab2b1158f1d2910479a29382d5599/62539030088.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/34062351537.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/4edfd6a2f424a45583b53a846d1bde0d/kosowafulegodisimeluziji.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/rawogowoxonojekotusugajo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161529a4cee0a7---zepemopubititivavarowadeg.pdfIn PDF document text
    • http://agilesolutions.in/uploads/8927364024.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/3071145669.pdfIn PDF document text
    • http://dip.natura2000.pl/imgturysta/files/damas.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d89c6742f4---74687878831.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/61022788068.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/kavetuwebiwu.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/51494446667.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/45753320833.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/f9ibv88hf38kja1124ltf79rre/kaliroxuxezowojikekog.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/17458742157.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/nobikef.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/nigebufovul.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/tulesukiwumitisinuni.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_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 10320 bytes
SHA-256: c37ea0880fc525367855c76add1230c386adebbe3be63a8c6d992bc16e4438b8
font_01_sfnt_off000124b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B2 20188 bytes
SHA-256: d6791725f9b0ef03c77117483c51dd7b18c5b3f64ae6f53d8c6b34cdb6c1fe08
font_02_sfnt_off000159ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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