Malicious PDF — malware analysis report

Static analysis result for SHA-256 f606b5a915d282e4…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 12:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d036d4497470699e9d08e75cd00da06a SHA-1: 8f6f6b43dc20ab0ccea10a3ea9889f4e9e3e80e7 SHA-256: f606b5a915d282e4b3df04121d2c2ff6eca47097fa2090e4897d0c51a6bb56e8
176 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, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the nature of the linked content suggest a phishing or malware distribution scheme, potentially leveraging exploits within the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=movie+rulz+2021+kannada PDF link annotation
    • http://185.33.116.142/~bbyacht01/upload/files/76347126812.pdfPDF link annotation
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/zajodoniridotixoza.pdfIn PDF document text
    • http://gibisch.info/files/files/74551551517.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/22393009371.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/pogatizoxobumemupu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ahhqq889jlrbr558c29huffmlm/pitug.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/4833332bbb7b9c28e185eef9f8624296/dinubovoxikov.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/kalabivonisevolepu.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fopevupor.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/zanepifotal.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/46441751325.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141a4130f428---guwivo.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/32378981162.pdfIn PDF document text
    • http://artospace.com/pics/file/wowubex.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/fipetimuv.pdfIn PDF document text
    • http://zenkatsu.dk/files/78951007338.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/6500918117.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/61764431395.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/58338481283.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/24632066435.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/liduxikozotokigulixilunug.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/70745018040.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e234b1f90---76757734730.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_off0000d914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD914 10580 bytes
SHA-256: 39f9cf5a8057be7aacd9944084ce41b09922490ea3636904dc32fae067389673
font_01_sfnt_off0000f16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 18428 bytes
SHA-256: b94e1ca0583dc7fdcd392f5f03dfb2631e3b090d2d89f22178b5cd29d0e03888
font_02_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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