Malicious PDF — malware analysis report

Static analysis result for SHA-256 867b27ecc9339466…

MALICIOUS

PDF

70.0 KB Created: 2021-09-19 10:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de580f1e2e7e757aced95747615961cd SHA-1: 13e974411fe92c060dcacb80b93862ac4677300e SHA-256: 867b27ecc9339466353e6a71dfa6901f830e9678e2d17276590a484461a49543
176 Risk Score

Malware Insights

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

The PDF exhibits characteristics of a phishing lure, including a small file size and an image-only appearance designed to hide clickable elements. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.findvoters.com/userfiles/file/daxufitajuxidesad.pdf In PDF document text
    • https://biothiennam.com/media/ftp/file/72634336653.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/29011610138.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/15177364136.pdfIn PDF document text
    • http://lex.tj/img/file/pezivijexogupuvuva.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/8193374254.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/78450439654.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/patotawel.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/10353173059.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/97209820350.pdfIn PDF document text
    • http://contextuae.com/resimler/files/vajilaxexufub.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/eaf578013e18c11bdf025bcb4e4497a3.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/88156444312.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/65335698011.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351926d2f0d---51660941315.pdfIn PDF document text
    • https://miet.hu/kepek/89016483626.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/kitefakejafaxosamilalugaf.pdfIn PDF document text
    • http://carbonelite.ru/file/mugiloduzijurexixujal.pdfIn PDF document text
    • http://szm.hu/userfiles/file/3982790303.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613170d8c2fa5---60546866324.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/14309192103.pdfIn PDF document text
    • http://ellev.fr/upload/files/87272729496.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/377pac78auragc53jomh52cv1i/dijifofajomejowaxapizax.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/11661725867.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/sadevokaxowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+lyrics+to+the+gospel+song+we+come+this+far+by+faithPDF 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_off0000b278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB278 14208 bytes
SHA-256: 67d989d8172b8efc86d981b534f8c0bcef54c7f587299b727f8f84b15f63c425
font_01_sfnt_off0000d5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 11228 bytes
SHA-256: 95101c1c4be992efa39926308446e79f6757cbcc7425dd5d144859cd1ca623f3
font_02_sfnt_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1