Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02ccb87f95ab649…

MALICIOUS

PDF

100.9 KB Created: 2021-08-11 06:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5a0fae8442e7b2e266766573e7e6ebd3 SHA-1: 3fd0c9aaabde88656b537f9cd3ea0e1561b200ac SHA-256: f02ccb87f95ab649ab9265f1ea3a47efa87142a5f505bf33bb84fd68340f4c41
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure points to a multi-stage attack where the PDF serves as an initial lure.

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://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/fk0j3fnbsro72837mljgjvacrf/22437071444.pdf In PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/9f3b96dc38559017c8d8d662f202704f/91665254678.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ac53d5f1260---54268332842.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093f2ad6f18f---demivi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9edd678697---97142271078.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/gavizufofiponiladuvu.pdfIn PDF document text
    • http://nfc.soo.jp/file/39612894309.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9112a0c26---remev.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e692adb5af7---66808422827.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9c15a6947---39219166277.pdfIn PDF document text
    • https://topupdana.com/contents//files/69085956699.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/91255194220.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/telid.pdfIn PDF document text
    • http://hkalc.com/userfiles/9149651666.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/d4mpssltdv11td8n8nfqaq1sdv/wajipixizutidevero.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/52031645204.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d264d183c11---finerorizebipogujuxepikas.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a206865479b---57867594995.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/10365782096.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/difuvezol.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3ee542af8---53534994683.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/44618942350.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/59764174983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=graphing+sine+and+cosine+functions+worksheet+answersPDF link annotation
    • 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_off00012260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12260 11172 bytes
SHA-256: 87a5938dd6e19ab0d678df355fe3c26600d145c3a8c0cb352a2b68f14b7ba9c6
font_01_sfnt_off00013c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001546d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1546D 18724 bytes
SHA-256: c7319ca9682dec1e8d9886477d69ae90b53db49d8d0970c69d219eaffc5e4a59

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