Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ce08df43aefd66…

MALICIOUS

PDF

108.6 KB Created: 2021-09-05 05:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a5f5037a4a6f01b204159e3e9933619 SHA-1: b0d35e3b3425fc945153bd4b612ab80ddff6edcc SHA-256: 28ce08df43aefd66cfd190c349ae8fa05d10d02596f9394ab012f4c4cb786887
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and exhibits characteristics of an advance-fee scam, luring victims with promises of prizes or funds requiring upfront payment. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead users to malicious content or phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://lederstuehle-shop.de/ckfinder/userfiles/files/benamokowavifefi.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16105c889b8120---sezaxakizirugawigomigumiw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a42616b8d3---tawudirozuvorudoxibejinad.pdf
    • http://reklamaopole.pl/userfiles/file/nipofisijof.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/r3uq7lnqlu1dilvsu2ja7eu2je/tevewuxiforir.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/3rt67k349v3jacl9r472ircq3r/wekebesorupibad.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdef0b9d781---67933229239.pdf
    • https://bushregenerators.info/userfiles/files/25412544945.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4bff483ec---reralaropotolakutogegezo.pdf
    • http://brmhn.com/userfiles/file/20210701180328_h7iy2g.pdf
    • http://fitviewer.biz/files/file/nukazosovemu.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/renipanijados.pdf
    • http://ruihuitax.com/files/file/85132059528.pdf
    • https://magerp.org/upload/files/92775033701.pdf
    • http://lookkorea.net/userfiles/file/rawof.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add70a1d08f---30104627172.pdf
    • http://fantasymusic.it/userfiles/files/nofalirovovulopilekuro.pdf
    • http://rund-sro.cz/UserFiles/File/31830495329.pdf
    • http://kroonzuivel.nl/ckfinder/userfiles/files/94906038253.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/cd9e0b993fc3c19c67f482fc23c8726e/mulugogopabetakawuw.pdf
    • https://bucatariizidite.ro/printuri-fi/files/18542861620.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e5356c24909---xeravezajavage.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086fde6c17be---254365631.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hp+dl360+g9+manual
    • 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_off00014323.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14323 16792 bytes
font_01_sfnt_off00015b35.bin
b417495a9cf044897c87d49e8b0739c75bc68648f1cf1c584e9b265bd56a5153
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B35 18820 bytes
font_02_sfnt_off00018c5b.bin
dd9ed613721432a56501c20d99178f5a29485f825ed572f341c43b69f5e4ee66
pdf-font-stream PDF embedded font (sfnt) at offset 0x18C5B 10744 bytes