Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84178544df0d1ed…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 05:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb5335df5962729542b4ec6dc717b55d SHA-1: fa2652aa156e47f29ab915a9c22354a57a067e60 SHA-256: b84178544df0d1edb08f296ae2078af3edc60870d0dd312460ca93f78e43234e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The presence of these links suggests the PDF is designed to lure users to external malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=malague%C3%B1a+salerosa+partitura+guitarra+pdf PDF link annotation
    • http://safetypath.net/cms_images/pafitaxabalo.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/50608298102.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/vokibofokufezozat.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/se9j9pren6g5jstm8rltvjl1tp/89060576774.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/kasabovamorise.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/nukoboxigibob.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/35855979793.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090655d0b896---wupifazemikefiwigegu.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/64128369286.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dc96bb24a---gubefotujadujibanonulub.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/kenaduzirikexejolaw.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ddd614a69367dcbb6e98095652db69f0/najelesagijime.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021052218483930.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/51113348257.pdfIn PDF document text
    • http://amandamaitland.com/images/file/31494653683.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/95c0ebcbf816122c48833eb5d8e15676/6196237938.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/taweguwegu.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/7525526898.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/vopanofurafosugojisiwawe.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/rarezi.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/58a8dac54a0d57220de7fee217a0d616/69670418085.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f16b12fd4---4099332557.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607903eb5975e---mamoxefutijenojebobeb.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_off0000bd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 17656 bytes
SHA-256: 935e6dfefae5c887d24047c5365ea03bbfb7b4f23c259c942723c6a7dd6708a0
font_02_sfnt_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 10868 bytes
SHA-256: c98318085a5ba365cc2cff41fb6faf841a8caf567b00acaf3a8a96b9dd3139b3