Malicious PDF — malware analysis report

Static analysis result for SHA-256 886c361ff2c560ef…

MALICIOUS

PDF

81.1 KB Created: 2021-07-13 10:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3dcaba55db8bb6bf2d4534ee7142ae1 SHA-1: 29981cfe9341a8e12dfa4e89e970fc8286d7d547 SHA-256: 886c361ff2c560efe37bf540237e67e9cb872d11b844436ef0e1dd8c0b133fb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The PDF structure itself is heavily obfuscated and contains no readable document body, further supporting its role as a malicious loader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://cructi.ru/uplcv?utm_term=about+philosophy+11th+edition PDF link annotation
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/81770d8678d5e67b3547b689e8ea60a5/16148373790.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/10448951012590d084f0b0569e2b4c28/kuserudix.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/40a9f710f70b91c9d31d8f417229ddf7/fixolesidi.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809728d9485---49203973477.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/55c58744e7086800b6b07f02d85d126d/39124348901.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/1usmvp6bced12bherh1fmohl9q/97836620056.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/jh1c7fobli5h23b969gqgs0jte/73947251370.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/seip15v5k212brt6u5ba4ngnqm/luminixoneninekepeda.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/59697061484.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609143c6ab5d0---91319713490.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/b55d8540e3f2fe22fd84121d05a1ca06/rurolutakesapijasevekam.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/83f750380d298bd208e01e0af1172627/pixexosokadewuro.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a937692d9d4---rofafusaxiwenifumimem.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/io6s5re467tfm3uc4bbq6rfgvj/86269678189.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/toviwinawimosezejipako.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/18218308844.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608120787efa5---vexiwa.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c24748268---25738833371.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/xatajorulifujebanedefu.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/93228866114.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070094537420---midomakedonawudadediwune.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/vrgct9qqadfutf3gqlltva6ami/55005454457.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/11928530604.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076f47977aa7---romaretapiledabufizo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda84a99d85---zunesopuk.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/63289109465.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c30ebb911ae12d02b2a0d3c95ae090ad/70222165990.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_off0000dac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 10612 bytes
SHA-256: 319de9263a30cb1f625ea243c7a2ca261f5dfdd9eb29cfb4c76a32f8f6b0b2a9
font_01_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 16964 bytes
SHA-256: fdfc52e9e15c34728a4c5fea21f64eca4c3cf378039257b48760f1c5939c528f
font_02_sfnt_off00011ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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