Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00f9fc75a75ae6b…

MALICIOUS

PDF

87.4 KB Created: 2021-09-06 06:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44e172f33cb4aca47ff87f62169cdf58 SHA-1: abd59e80941992545500bcd533f6b9541ad71fab SHA-256: d00f9fc75a75ae6bbb77a6def2807cf60cbfe59c8e492be3f0504921e6638929
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac885186bbe---tizojela.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613534fb10381---51093332057.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/51055a4e8c2d8b6736c45aa699f02672/bevivo.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/bb2c732d221491f32ebb26331bf0f14a/42131220041.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a254bb2d7---bofedifexajolibaleru.pdf
    • http://diskacme.dk/images/upload/file/4829438367.pdf
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/31573570504.pdf
    • http://ahchala.com/img/file/16721182791.pdf
    • http://dailymaydemtien.com/userfiles/files/zumozusezofowe.pdf
    • http://sys-svinding.dk/userfiles/file/vemugigipiwiluj.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c879c9eb1f5---kajaroravivedowisitosoliv.pdf
    • https://calienglish.com/ckfinder/images_store/files/neritakumobiroja.pdf
    • https://srldirect.com/ckfinder/userfiles/files/pikovosopije.pdf
    • https://aawyx.com/sites/default/imageuser/file/50805781293.pdf
    • https://aquafilling.com/userfiles/file/jofapifunugakake.pdf
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210617_6B1ED9906248341B.pdf
    • http://accessiblevehicleservices.com/userfiles/file/dokusekanesoj.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/jedofunedatizapiv.pdf
    • https://inunekocp.jp/mailmagazine/upload/files/41209316063.pdf
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/domovanomozaritan.pdf
    • http://www.annaleehuber.com/content_files/file/43647176538.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/h34q67hq6kdr59bil7okijbhje/fonesexapuw.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/76523140943.pdf
    • http://na3.it/misc/file/51281092115.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=funcion+del+selenio+en+el+cuerpo+humano+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecec.bin
4a3d393f0351074dcb4a402c644b3c9ff7b2e7b4846d4564ce4641302b590f4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 19172 bytes
font_01_sfnt_off00011d20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 16792 bytes
font_02_sfnt_off00013537.bin
e22d8a9f52b5d52bd275d8cadb90b912947c641ed903e27dc925242619233c56
pdf-font-stream PDF embedded font (sfnt) at offset 0x13537 10864 bytes