Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41d2ecc0f2dffee…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 12:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee484bc2016d7c05a2ce9a13d18a6703 SHA-1: 80b95cab07d6391a316cabdc8ec7c48150f672e9 SHA-256: d41d2ecc0f2dffeeaa8202fe0d5d9e2666c891908ab6086c70f46833259cc94e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=all+my+life+watch+online PDF link annotation
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/0islvap7piuii3ie0jsbhv966d/mizatewibapowuzaloka.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/32994049873.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613593af2e15f---zuvajagetopenupokelu.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109082154253960.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/wavawupulawemu.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/novonawegam.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/darojesoxifibim.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/28880281952.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/jotaloretox.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/89640028114.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/dugozuwigenudeno.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210909020756.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/dafunupisopoxajuxulozaxa.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136db90c2db7---17148925250.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/45115889504.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/75219835379.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/73695319922.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/vedanigo.pdfIn PDF document text
    • http://aa-nusd.jp/7654716824.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/43149202860.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/vegazafazobozo.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/72353918315.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/powipasi.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/rakaboximuma.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_off0000d7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 10516 bytes
SHA-256: ff8b6a970add5ba12869f69eade9f501c89c6179a65cf847107fba9c8f58c64e
font_01_sfnt_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 17844 bytes
SHA-256: f082d23c2b44591478c5851886445ff2ea685421d627372b89401b2601098de8
font_02_sfnt_off00011d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1