Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5f776a5f99b863…

MALICIOUS

PDF

79.6 KB Created: 2021-06-27 21:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ece8d33dec868d5026aebba67fe854c SHA-1: aa719f48ffab9ed963b68b787e10b7d454b5fd78 SHA-256: cf5f776a5f99b863f655475073a17d95473d77ededbc7ad6a9e644e64a94bbfe
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting domains. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/fe0d7d6a53ab3a5a10c4e20fb529b0e0/nozevilagasoluziwi.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/93d21041fded44f148c20e99a91658b6/josalimalejakogin.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/34409679838.pdf
    • http://hondatayho.top/img-ngocbao/files/342350571.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae688db88---39113755354.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf9e24c0bd---fulimomoxirefafisuwox.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/47077202209.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16070714448d2b---41815278026.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/33230304369d333537d42c5bc148f567/vubojivuselog.pdf
    • http://abcbyspu.net/ckfinder/images_store/files/pejogatexuxaruladazar.pdf
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/maporane.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/vfglco66dfq07a124ci19sfkph/jilafopip.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090671e106db---xuzemesabofenuzevoboluviv.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/oj0hlrcqno3ffed5v937ciuro9/77440562082.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a7174591---79181046309.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb03867b1b---4243613304.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc6557f50---20489281620.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/907704319609da042b39d5.pdf
    • https://smartcirclegroup.com/userfiles/file/razip.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/pijazarut.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3daee988657cca9f5a1943c2e60a4368/26081970579.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837c8457633---54578031955.pdf
    • http://xmst.com.vn/app/webroot/uploads/files/tibuliwux.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=lord+i+need+you+tabs
    • 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_off0000d193.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD193 16792 bytes
font_01_sfnt_off0000e9aa.bin
fac6f4b554b93d04ddf8f5f986f0f27bf2a9d567c48b6e104befcb02351d8571
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 10504 bytes
font_02_sfnt_off000101b1.bin
931dc25a06ac32dc69067bc864e1bf82c040857d79348c1f8c3602dc3e7d4d23
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 18208 bytes