Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c2ace0327b6acc…

MALICIOUS

PDF

94.7 KB Created: 2021-07-14 02:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6f97436468c162d692397e83a3ab247 SHA-1: f0af8f22829083bcbd53b213268706ac2e31e339 SHA-256: 73c2ace0327b6acc6d03304b97316fb1da6f46fa67f4810dadb17cb580f691f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to facilitate phishing attacks or distribute further malware. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://ketchas.ru/uplcv?utm_term=how+many+panic+at+the+disco+songs+are+there PDF link annotation
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/dv777e31262e3mjbvk6ihghs81/kenisaf.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cccdbe93fe4---xalemepokijovuvijaki.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/adbfe8297f58ee70aa622451b1dfb396/85606271129.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69253175b1---76472125336.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/zamonuza.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c6bab7824---mapodoxerividolitukob.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/lafuni.pdfIn PDF document text
    • http://amdind.com/userfiles/file/85314335198.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074254236440---bukebufofakaxizi.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/96492376178.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b536c6471---binumokidoxu.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a965f179c9f---7922735465.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/74vv3l8qfnc4fek2s4kg3og8r6/75644995656.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/bopozitejadasekivafemu.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b471734bd88---zatofav.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0a4ec38abd0870861fa1b12cccd2ed1a/2706915344.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16078b829b6784---pawaseruwovusejom.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6178c7cabe---xulabepopibopasinofipi.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/24875374803.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e922113b86c---guzoxelolowepuwulafinibo.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/10856490416.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/motamafox.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/20344242014.pdfIn PDF document text
    • http://idroter.org/userfiles/files/sagatebaxukumipodux.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/tukolegejifijewazinibe.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/89318688792.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_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 17816 bytes
SHA-256: e76cf29cd74a8e1b9c257e6192be350c6434b4d7ec756ccedc7e3c443f6bfe75
font_02_sfnt_off00015393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15393 11104 bytes
SHA-256: ee2760fdc9e0b7b696f0ca5b42c561daf7b7903294dbf15a4f494067f2ec4cc3

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