Malicious PDF — malware analysis report

Static analysis result for SHA-256 8357d47e66fe3ad9…

MALICIOUS

PDF

95.6 KB Created: 2021-07-06 02:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bccea56679d29a8b8687f02f636c3ded SHA-1: 6853192a34593883a88830569462a45f4720c91e SHA-256: 8357d47e66fe3ad98153591b6e1fd2556e965229ba071aa2c06a2d728fbd2300
156 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. The heuristics reveal it functions as a link farm, pointing to numerous PDF files hosted on compromised CMS uploads, suggesting a phishing or malware distribution campaign. The presence of multiple external URIs and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://podiummoda.ru/userfiles/file/99340524830.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v467h9em9poloj1poft90brbi0/64166514031.pdf
    • http://reelproductionshd.com/userfiles/file/jakomixiw.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e65c7600a177725c3c30f3754f06c81e/59998149058.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/38f5a40c46e2f9216f52b7d8fd8b7af0/2666641690.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/afa0b693d059363d7ed3f9f79f9bc14d/95069807505.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/cfa828cfffc775b39eb38ffb25da3b4a/62279465730.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fc7e2fabe---17929587403.pdf
    • http://scro.ru/pic/file/diworidatukosi.pdf
    • http://aromaonly1.com/yamituki-n/uploads/files/93226688313.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160de8a3696fe9---kogutulik.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e35e30de6---dumazebinefuvogaritejesox.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba7db34970---93282669987.pdf
    • http://fautographie.org/images/userfiles/files/vonarerakejudibevuda.pdf
    • https://liniagdanskzydowo.pl/files/78223438571.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e7b8c40c3---tumuwaruses.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/df34be2065febb8fbcfb02265ac029b6/78260965166.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/rulerekovejuvem.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073635f330ba---sivelimon.pdf
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/39900898106.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/ee9a8559063939cd24ca8dc87466d9f3/69384853210.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/53a22cf8c22690765877548acec32452/laxivagik.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=quotes+about+snow
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcd2.bin
bf315525380dc98b496c7271f1a9bdd7fd28028b4cb80d371283449a51f92260		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 17928 bytes
font_01_sfnt_off00012bfb.bin
b646e4e99f19ac05519abaf59ecb91311bfd919e7d59cfb2ca623a477a188405		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFB 16232 bytes
font_02_sfnt_off00014183.bin
c317f42e42407fd57cb6903b353b15fca65ab7ce91cb977bc877d2c793675b88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14183 10248 bytes
font_03_sfnt_off000158e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158E8 16792 bytes

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