Malicious PDF — malware analysis report

Static analysis result for SHA-256 68fbcc01b34ed2f0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 05:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d325e9c61f2ca5431488dace8731b082 SHA-1: 19cb3f24d4f58b4f92443c67dea0c7202027fa75 SHA-256: 68fbcc01b34ed2f04c4abe3cf814057f4c453b79a158760f1cfc63c09e9a8663
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=how+to+download+igtv PDF link annotation
    • http://rdmsrl.it/userfiles/files/xagamuwodil.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137632b135cb---38605683256.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/puxazerodunojuta.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133920ad3c71---55256001315.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/titunox.pdfIn PDF document text
    • https://abss.pt/userfiles/file/kewuluwebogolosufuxisur.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/74652686632.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/vixaloputep.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/wapusisurosod.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/28833275280.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6362905ae---13820196663.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/51684277672.pdfIn PDF document text
    • https://2winit.com/Files/files/57585718731.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/siwazivizijekuwuv.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/64075208043.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/dabawenerusobiguxux.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352fd4e36f1---pokowabojine.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/66900285656.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/mojigekud.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/73203211207.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/58637614540.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e87d1d1879---xizoriwobe.pdfIn PDF document text
    • http://generoussecurity.com/uploads/46883389230.pdfIn PDF document text
    • http://congtyvima.com/images/Download/8514257040.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/jumire.pdfIn PDF document text
    • https://sainaudit.mn/File/luzabisodiditiva.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_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 17424 bytes
SHA-256: eae0e48f31ef264d245405a8379c3407f395b0a8e08efb006fb744613f9dd874
font_02_sfnt_off00012525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12525 10164 bytes
SHA-256: 0996ab6c497f6b87db1db78150ad20eb11418a0270a23f02f7df24ff580dba9c

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