Malicious PDF — malware analysis report

Static analysis result for SHA-256 02899b7f177cb308…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 13:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6b022a8afdecf3146eb869155cf5ba46 SHA-1: 4ccc96532e7dc792e02ba57f376fb985dd943aac SHA-256: 02899b7f177cb308320dbc70c8dc868b9362ceb3156f2d1444ca441aadffb6cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign or a distribution mechanism for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=condensed+matter+physics+books+pdf PDF link annotation
    • http://w-f-l.de/user_img/file/60535494762.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/83433276657.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160abe10ceb47a---79063168797.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/77340962080.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0ce0232c75d4d685a9a237c1ff0cad8d/gumow.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/64315734947.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/6e7ae66fd97a919d633a191fcb32c412/359471585.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/cmpsu1onognb2v3f0v011mfan5/xafowogufesexigidi.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/rigegikavotuwuwi.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7dd4063767db0da4c593d616acae2c7d/jadiruxewiwuz.pdfIn PDF document text
    • https://guijek.com/userfiles/file/48691507405.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84719deeed---77160835390.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210607091311.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/2bjhssn8lbfrv25iru6n7crvl4/78422551382.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/vfgo8g5chocvskvbncbcbnop0j/42670794503.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/35884851721.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/kotoxojawof.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b494354857fda55299ba7dae3b64c505/38459654540.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210524101105027.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b8a5e22cd2---45735132058.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/femilalavijov.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/86167365607.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_off0000da02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA02 18308 bytes
SHA-256: 65a982ebb06168b8fe5753f7704e85de6df339eabd03bef85b15654543933f71
font_01_sfnt_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FA 11216 bytes
SHA-256: 7817ed45aecde3241c5e64c342935313a78c19f35bb5e20063bca88e42c5aeed

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