Malicious PDF — malware analysis report

Static analysis result for SHA-256 74845244b803a149…

MALICIOUS

PDF

85.4 KB Created: 2021-07-10 03:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9dc4c3f3f348e5a0605f993d016275e SHA-1: 42812b32c58b2de2fa0b30fa91b456a72def61dc SHA-256: 74845244b803a14902d1cdc186ff7af19dcc5d5cf324fd4c90188eedcd0e24b6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories. The PDF itself contains obfuscated content, suggesting it's designed to obscure its true purpose of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://franzoesischebulldoggen.eu/userfiles/file/85919117843.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160acdfec10ba3---pivimiziresomo.pdf
    • http://modnyi-buket.ru/uploads/files/49330563773.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/6c7cfc740cde07cb3336c267cb133329/88782561322.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160787f8af3bea---86914436899.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/jpor21dm87kd6377slqli6khnl/38450101816.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a5ba381f---45109662051.pdf
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/fetevedazigivorumapo.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083294c9d7fe---dufubi.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72f49b3c1---69758745957.pdf
    • http://a-mega.ua/images/uploads/file/selafamivaxejosotekikamif.pdf
    • http://prime-standard.com/piceditor/file/givanadanogil.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873eb27dee2---17901223807.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a7670d82---82560285538.pdf
    • http://nfc-lampang.com/user_img/files/37133406030.pdf
    • http://akinmedical.com/uploads/file/62447629556.pdf
    • http://studiotecnicobonoli.com/userfiles/files/90322017954.pdf
    • http://ipceurope.eu/assets/file/kavipivumirumobarixeme.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeaba3419f---mumubejazamereputo.pdf
    • http://myjobcareer.net/userfiles/file/2021061404240173499.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/lmr4vrfe006a2dqakpurnqt74f/25973985708.pdf
    • http://utuin.net/files/fckeditor/file/kelexemufaduva.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=artificial+ripening+of+fruits+by+ethylene
    • 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_off0000e96d.bin
e95ba8df47eb93d0927a6a1d04ff1e2a55e27cf0014b36377f678d02fcb0d4c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 11096 bytes
font_01_sfnt_off0001030e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1030E 16792 bytes
font_02_sfnt_off00011b20.bin
d3ea308b494a049962af45bdd9e29a9efae2d3725b7df4f85cc1a96e7aa69281
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B20 16704 bytes