Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0502d6f88716653…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 15:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 886a69f6616426b5e95edab4844ddfaa SHA-1: 22190a70dfd85391a0ab021238f25ad69314abd3 SHA-256: a0502d6f88716653d616d7c5fec839764f7ccd61ddf16d27c2735836e8d57580
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://audiohrestomatiya.ru/content/file/23184870947.pdf In PDF document text
    • https://atlastoursntravels.com/userfiles/file/11972220737.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/16678717319.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/47185e4861c3b69804ed9fe9a674d212/fufinatebi.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/fuvumaka.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/mixik.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/92199296635.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354c3b3128---84258246868.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/zazuletetedivodusenagobe.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/6302504923.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/wefimemenud.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/81573124007.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/44525522885.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/77494923472.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/66684681988.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/nelidikavizodatujez.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/vaxikorokukevaj.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/54005155167.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133c67008616---48656637665.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/25383915419.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/dawakajelu.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/94035618024.pdfIn PDF document text
    • http://lblussana.it/images/file/89442750411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dark+heresy+pdf+itaPDF 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_off0000ddd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD8 17916 bytes
SHA-256: a1b1cc30e012b425f3ae25210d3bb8ce3273eb186f6a1103791544486cdee2e1
font_01_sfnt_off00010c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001244d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244D 10532 bytes
SHA-256: 2fa14d6f1009512c1242dd36d83c31113c12b68413477e601d981b15dc9fa7ee