Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52c47decc8ac729…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 22:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 333bbe237fc550d26fe689bed26218c4 SHA-1: 3433d7081a0613f14fd348f68c95c557191bed9c SHA-256: c52c47decc8ac72950e8ef923c5d4db34cdbb650097d2228acd33864ce877668
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://logiccpacma.com/ckfinder/userfiles/files/359172244.pdf In PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210910_11FA4EF1C2418562.pdfIn PDF document text
    • http://sbairs.com/datas/files/fuluv.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614d66bfc0b61---7663949609.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/disigutiwojifamuzefofumo.pdfIn PDF document text
    • http://fnathservices.com/upload/file/64797463868.pdfIn PDF document text
    • https://tebra.si/userfiles/file/najimipovufomeporakufulaz.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/59915160092.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/xuvawosidotatixer.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c782986bfd1ecb0c9b57cf458953b357/libofatazeji.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/joziditifemazi.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/gigobofaratuwuv.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/vakezovupuz.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/65820873287.pdfIn PDF document text
    • http://benrassam.com/uploads/files/zugem.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/69758303498.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/49406781409.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/35157059805.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/77523479697.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/kezokudeviwom.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210918075310.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/49124114044.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59cfa4492---guwowutobotufuluxulu.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/jevuwudopusuxidifet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+change+location+on+pokemon+goPDF 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_off0000b1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DE 14552 bytes
SHA-256: 38e9b86e917ac99a5763d1b65ec4693b8e1423bdf4f82c7c2da2fc1978659e5e
font_01_sfnt_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 10720 bytes
SHA-256: 6336dac40b3389acccbed178d7ed9060e609dbdef61f4ed5174de894a3b84a82