Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7932d92a256949…

MALICIOUS

PDF

99.7 KB Created: 2021-07-08 10:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a91450eb9991a78bd4dba72a47bf4393 SHA-1: 5942e9bbef53c6543bb92420e70a9c8c1c589318 SHA-256: bb7932d92a256949eb29718e4586827348c8c05b2c9d63cd5a36b1eb5be3da6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. The presence of numerous links, including one pointing to a compromised WordPress upload, strongly suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://thedreams.cz/files/xugexum.pdf In PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/23841443528.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/81101767946.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/95477811493.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/tavifofabijifeziza.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/7e74b9d34e205b391d7371a10e77d8ba/jepijilu.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/62989535391.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/223701434414e6cbb31092b559d30d36/19811753219.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/letexusuxelejum.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/jsuguenr5fpur99nqdprojif67/85686478652.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/nevawugi.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096aa3d7611c---zawimubekadosivogitokoti.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/10143360730.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/36399547788.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7d292f17---nepiviruruxeris.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/zekagofizotefugesipawad.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/50767351514.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/57381273210.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/da40684c2544941b54224179af452d84/75564389403.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be87e21df4---fetawaxe.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/acfe34303b8819aef6bc7c223311d155/joladam.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/97779667729.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/2r32q2lsinjlrin4lfhkl33joi/fitojazudobesilo.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/dubaxilik.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ef96161ec---keposozovaturiki.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b59c5daa5---28213406998.pdfIn PDF document text
    • http://www.nomorcantikspesial.com/file/pudegivetoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mvc+advanced+interview+questionsPDF link annotation
    • 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_off000123c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C5 10708 bytes
SHA-256: 61d52a0e488c1de764b36e3c02b78daafe8084748d44f2e6fcfad0624a020911
font_01_sfnt_off00013c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15477 17228 bytes
SHA-256: 3e3da964d10c4cf5eba624dc31fa60ebaaa4a9f11ac3f301a26bfc8221be2544