Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d85e74ac5212b7…

MALICIOUS

PDF

76.4 KB Created: 2021-06-30 09:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6389cc24b27a75446711fae875af98e4 SHA-1: 2407a469ebd5dcf6c3ab72013ac09934a74871b5 SHA-256: 33d85e74ac5212b74e272f19d8dfc529d162a48079dea0f9b95af98b4b6e3ad9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to potentially compromised websites or phishing pages. The presence of multiple external URIs and link farm heuristics suggests the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://chcial.ru/uplcv?utm_term=2000+sgd+to+idr
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9d4c8d6914e1f29a6f2e2f94761e9350/pogebuvinijor.pdf
    • http://ckpak.com/fckeditor/userfiles/file/39136431858.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815205c2f4c---wewavibesogasanozide.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c870312c4d8---vifepusowutigob.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084be5f6b5a7---febotiw.pdf
    • http://domeinbeverdonk.be/assets/files/file/gujoditeta.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5457cda7d90ff881bbb679c16604fa5c/repijikifibaxitafoj.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e4bdae138---8984470146.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/20df18b9e1d86809fc12ee46ae853f38/46418786337.pdf
    • http://agrobud.net/uploaded/file/jamoxik.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/hovsnlf9qa76hql4m1kp4o5n6g/58210819802.pdf
    • https://clickkedai.com/userfiles/file/ruvuzovobukinuravuro.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/t5qdpuhspbnu5i0pbgshmi9gh0/dabavugatobedol.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/p1vahmu4v1t62gjnta9amqtit0/kupakanawerenedixuf.pdf
    • http://fw-simple.com/uploads/files/sazapo.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccac105be9---99318656449.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f6ea11ec---50268438447.pdf
    • https://theatresaucinema.fr/uploads/file/7145252990.pdf
    • https://purefeeling8.com/data/file/lesugosimekajugovalabuk.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3b677cbbbd6ad1bc4e6c93139d6933a4/jolozikekoza.pdf
    • http://anjilh.com/uploadfile/file///2021050218184289.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c07ed9078f9---93243250720.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/kgqrsmfsn2peadgl4p0qq245rs/bawutibopuluregelarovoduf.pdf
    • http://sns-russia.ru/userfiles/file/28821902821.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e38929f4---wogexezoxov.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7D 16792 bytes
font_01_sfnt_off0000e494.bin
310fc0ab8a00f302b2aa995652cab8c5ae06e6c92881917691cb0a3d6553b1a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 10124 bytes
font_02_sfnt_off0000fb0b.bin
82efc01700b21a0b5a949f1c96b158df38faa1823b69e47f8d947ad241a7e648		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 16120 bytes

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