Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db98394ba95609f…

MALICIOUS

PDF

70.8 KB Created: 2021-09-06 11:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d26dcdebcc222c2cb587c8183b8eee22 SHA-1: 1663696bc002becc6d3f941a7295606639f4e504 SHA-256: 9db98394ba95609fb7be1ea9e11b1c2c562e8c81e3dd45c2886fcab1adb8f295
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://rapabzenec.cz/obrazky/files/tadototuvuxepat.pdf In PDF document text
    • http://sport-way.ru/img/file/25111159847.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2904e61017---nemopuwaxopeja.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083ad601161e---66895703553.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17565d6c9---jukijit.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5cee6281---segoralanitutoxax.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/sidada.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/rasawipeduforetotaro.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/hb3ejimumo63mo7h44s2dmvbur/vedudevozika.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/35cc53ab755c7133ce35588bef0e6264/44252055822.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078f729ac682---vokasuz.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/sigufuxezekixot.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/zeveremupakewewazepovu.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/nsqblircfmq11qi1nngt8iqcc4/42200087346.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/ribimajor.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73fc156d6f---naxipevigapanugimoger.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/82759880642.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a815b113dd136c734dc2e2bb28f76420/45991354529.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210626112652.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/tjneo9n9jp097sil1tritgbsk7/16921413176.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/91404024205.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4bb841709---kuzakefegizes.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112232860b9e---lovobilegajogibu.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64552181538.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/pusipalijuvivixi.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608594de77991---rutexeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mergers+and+acquisitions+strategy+valuation+and+integration+pdfPDF 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_off0000b6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDF 14600 bytes
SHA-256: 0261ecf0abf0673605af6a23e7941132f02215f28e32352dd7867d624dc2425c
font_02_sfnt_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 11212 bytes
SHA-256: e233b0bf7b6cfefddf13f02c7a65293b5bbc139e3f89b23e4cf0907095950100