Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d988ec90161ddf7…

MALICIOUS

PDF

96.8 KB Created: 2021-06-27 20:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e61754dd00e2b746f3e4cecb059f06ee SHA-1: 106d6a50114b7685664f92b9041c3185a6eaa8d0 SHA-256: 3d988ec90161ddf76d0e6e06729806cb812e9acda8c14201e88a1997a438b0aa
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

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 http://imailbox.nl/images/uploadedimages/file/niwolipanumamivafinok.pdf
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/rodezubewamibif.pdf
    • https://mattress-leader.com/media/lipagobasizenak.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pa598am6ap8t2d0f7lv8hvqned/15796813831.pdf
    • http://coyada.com/up_images/up_images/83737427609.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/6u2sicl4t4dap3328s2d9aebm7/winoxuk.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/531047b86dc9caa5cbf1b034a7b1b741/54452487786.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2dddebad88---desaminis.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae9d3769e---jafomuwunomipuxisibetuda.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e27e940764---5146766515.pdf
    • http://szguilong.com/userfiles/files/92846978238.pdf
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/66308759834.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sugasapojoxe.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/39e4dd6ab17b6e26e7f439c3d7da0999/godidewuboraraxotaw.pdf
    • http://tokyoto.pl/UserFiles/file/79201839185.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/c731487630fc56a8e59b27b19f680573/82954467838.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e5eeabb2b---87039551456.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/c9816d6d0353e24ff59d0a2b2cda6280/6606517232.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7a289d966a6bd88530a31207ddbcf985/86021714581.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b26a7b30da9---19205954233.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30f774c4ce---96129861301.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/22491345254.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc4b75285---17269063090.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/35358dd5e262f1d5521d786c1bb64945/2402223780.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2fd95872ceb5c0ec2a77525ecd8f012f/zerezakedusixanisonub.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b986cf9eb3d---mufifub.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=biggest+polluters+companies
    • 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_off00011706.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11706 16792 bytes
font_01_sfnt_off00012f1d.bin
2f9573bf66db9a05ee3e872561859fc698aecbc7d10100fa1f7d81ee74a0cd5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1D 10868 bytes
font_02_sfnt_off00014840.bin
b7e921c0489eb223ae8f19c5abef3eaf53ca0b4a45d569dd7b745769c1e53e40
pdf-font-stream PDF embedded font (sfnt) at offset 0x14840 17412 bytes