Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bab60c9f598294b…

MALICIOUS

PDF

71.8 KB Created: 2021-09-20 15:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ac1db95db91917a9f9260fac1c06a6f2 SHA-1: 4e3eeb440c8039e3cf4694d485efac5b0ac66ff6 SHA-256: 2bab60c9f598294bf8ef014bdd44783c6d61daa33f0f29cda0dddf16794cc1f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the compromised CMS upload link heuristic indicate the document's primary function is to drive traffic to malicious or deceptive external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://allytemp.ru/uplcv?utm_term=ccna+questions+pdf PDF link annotation
    • https://malashealthcare.com/userfiles/files/17073457640.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/nepuvebizegelegiw.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613419528f09e---jiwidi.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/sowubifumonora.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/kisoderebujipibusakufip.pdfIn PDF document text
    • http://novafish.it/userfiles/files/36886177615.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/82390582162.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/81155213125.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/93518838453.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/6346356052.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/27574075081.pdfIn PDF document text
    • https://shunnasato.com/24531388687.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a649d48f4---99903830110.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/62325260688.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97658494595.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/zurimejusagapibifurum.pdfIn PDF document text
    • https://bursac.net/userfiles/file/20877743016.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/58524248603.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109070543151065.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/9498868576.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e945d62ee0---21775845379.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rijopafisaf.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/39422108608.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612edfe0422ce---dizuwazudunapukob.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/resekofowodimafatagojexew.pdfIn PDF document text
    • 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_off0000b850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB850 15880 bytes
SHA-256: 91e141ac5de29cda6737d7b758141fe7e58dc90de36b64be17593555b172a110
font_01_sfnt_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 10744 bytes
SHA-256: 3e90ed66e8a2af27ba248ec4be76e359a6d30a7463ef66e5f964fe521f028444
font_02_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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