Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac7ff4b5303828c…

MALICIOUS

PDF

121.1 KB Created: 2021-06-28 22:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a6088065f51ecfb7a3013a2060aa19c SHA-1: 6c4cb1960280a5ae209f9d0bbab77d5aafdb6025 SHA-256: 0ac7ff4b5303828ce7344fcc33a1a107f554118bcc86cfaa530338ca50146075
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/33d71c3dqape3q6nf1jldl45m2/zozajekugedilokezejaro.pdf
    • https://abofahed.com/userfiles/file/459397838.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e9763eed1---15298070575.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860094077dd---79636950912.pdf
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/42799500634.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf38d3129---60611005853.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/28bd1841f771b4141a9fed3e8db3a724/28342290631.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16095f71b2b451---43222214524.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/8jepq19q49a84lihk6dp4ef0lt/75552508518.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/cd905e0d6c7f5500d8cda982871879d9/87903792237.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/94c0fd33c7334627385aac355ff0be65/61275940313.pdf
    • http://coinmarketsuite.com/ckfinder/userfiles/files/luwinudosipozijen.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/66df6f1a0350e622e5ccab78be5a3299/wefijitadarajunepev.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de18127aa1---76969898164.pdf
    • http://cancercareresearch.com/userfiles/file/minowogifinure.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b47e9f1b187---kazojewo.pdf
    • http://rajskiewakacje.pl/userfiles/file/sifijojilejidedobuladij.pdf
    • http://pusancard.com/userData/board/file/87509445299.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bf44d3fcf97905b655ce9821fdc070c4/80341606520.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e89da7821---24387096705.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/60c402d75c9473fe5414e3a36cc1bba9/55218166478.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7ea3549511b34cf1c33af9ec84452f6f/4782864037.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e94addae1dfb1823c0ec01e3aed54b8a/kogonot.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160990853cc287---javenaj.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160942114816f1---49706600470.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gambia+natural+resources
    • 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_off0001793e.bin
f45459264c53a7261f7cc62ba987fd2548599293ea55de7826852ae2414c30ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x1793E 10672 bytes
font_01_sfnt_off000191b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x191B2 16792 bytes
font_02_sfnt_off0001a9c4.bin
16f2b5564a84b2897e983222425105a0ec53766ff7be07d3c3d9078c32baa5d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9C4 16900 bytes