Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f51c15c0bc51ad…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 13:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36345641057acfee96e451dacd6743e8 SHA-1: 13760c1f391af5bcd8610cdfa87b0c8e371beef9 SHA-256: 02f51c15c0bc51ad1be46b769060316f8077ff50a21516ba41e319fa293ad460
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, some of which host further PDF files, likely to facilitate a phishing or malware distribution campaign. The presence of a 'download button' lure further supports a malicious intent to trick users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=can+i+add+apps+to+my+firestick PDF link annotation
    • https://commonlawhouse.in/userfiles/file/80720759990.pdfIn PDF document text
    • http://lejonhund.com/upload/bigexeg.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/kolibazafunokisamifolatu.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/rotodozakidesa.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/22031687076.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vabopixufebuxixazow.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/50274940678.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/73379419014.pdfIn PDF document text
    • https://506hlapeta.com/files/file/reberakusizewovuwi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16146e5b2f2fec---lafuvilopitisesogerikutil.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/9988886646.pdfIn PDF document text
    • https://tch.lu/files/files/10573109140.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/65009483781.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613285a56e1ad---winubosajaxakofibawugete.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/52702717864.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bde4c808c---papazofikuworuk.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c98b40214---wafolasifot.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210902235044.pdfIn PDF document text
    • https://wita.lt/images/files/14463464874.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9d87d55f76cb2d1254e8da3449a35186/39045774497.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/nisezupegojaw.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/tonajikizetesoj.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/judiminasetiwidasukaxixis.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/63573970939.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_off0000e69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 18456 bytes
SHA-256: c9612c78320bf425c3653853f48902f6148b009cbc79c13406fa1daf8279d4cb
font_02_sfnt_off00012d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9C 10972 bytes
SHA-256: bbc9263079b0e0d8e32d5340015e85ddf57060fb280bed54a217a545dd0858d8

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