Malicious PDF — malware analysis report

Static analysis result for SHA-256 03597c56d83c03fe…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 02:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66083bec174f6b92c4b9a17dc3a74217 SHA-1: 2ae0cc713cdfcb47a687898eadfc7d4e5326fae3 SHA-256: 03597c56d83c03fe698dd5788f22ff3a4a26347dbbef4550f325a6953c10739d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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=lit+killah+the+game+online PDF link annotation
    • http://alliance-ic.ru/uploads/file/43010742814.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6b786cf989e32cff7314fef843cabc99/49868043111.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/patofepezulapipatareruj.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/zexilijarokoxuperijag.pdfIn PDF document text
    • http://grandfiltr.com/files/file/rilodarumapanozawifopej.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/4039068431.pdfIn PDF document text
    • https://gencatakan.com/upload/file/93888695687.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/mupova.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c119e26eb5461d092c3729cf76cd6d9c/pigagejovux.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ihi74kocpb7ptk3ne4his70ae2/31070542321.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/nolasugorimawegefegomup.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3dd624da4---pifinanomasanidevafag.pdfIn PDF document text
    • https://icbacademy.com/upload/files/68065500165.pdfIn PDF document text
    • http://ridendo.cz/files/file/4192820279.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/10936761382.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/besafunopijedibesap.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/4120143044.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/89358451702.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/wugabogomazam.pdfIn PDF document text
    • http://tianfonmm.com/d/files/22987236457.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/35750054486.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_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 10336 bytes
SHA-256: f11e0ffeac4cb7dbcaa7da2e315bd5e6f0a492d08a61a5778345a46b98e11555
font_01_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 17864 bytes
SHA-256: 7ec5f43b91d3299819432510564526459c1d30747c88321179c57eb2e212cad7
font_02_sfnt_off00012479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1