Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a71356c9238fa90…

MALICIOUS

PDF

53.8 KB Created: 2021-09-25 14:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b24cfdfad6da8262d80483c68f42797b SHA-1: 1d93c8f439272f115e601aec8466840a85799087 SHA-256: 9a71356c9238fa908959d354845e693f5def2a9be6081be1fd16bf50d7c4b3c8
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. The primary purpose is likely to redirect users to malicious content, such as phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6827

Heuristics 5

  • 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
  • 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://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wobaxojugunata.pdf In PDF document text
    • http://rentbucharest.net/images/userfiles/ruzerodisitonefasexiw.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/85098461293.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/85223035528.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/87734274726.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/12740219469.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd6c4042e2---47204658956.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3e58fe4a69c221597c46cc89edcff1a2/bawamebovijifixulunaziran.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/maraji.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/78985361827.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/41599880068.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/wimetajojofidunimetinike.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/gibekajatewa.pdfIn PDF document text
    • https://clickbox.ro/images/file/wimomefetinufefuk.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210905132152_pkkzs8.pdfIn PDF document text
    • http://chromavials.com/d/files/8936685750.pdfIn PDF document text
    • https://produse-zilan.ro/files/tefogipoxividozit.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/fajigovesozebu.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/puboze.pdfIn PDF document text
    • https://reniuved.it/file/81236426250.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/70365682845.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/womadonakikupijojuzar.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d6f0771fd0268a8a5bc547e31d6ded77/49179257998.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/3cqnc97qrroq72j6kgu09ccmq4/92954729185.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/91621357232.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/wulusedaribune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+animated+background+tutorialPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1