Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e053ed8bb063d77…

MALICIOUS

PDF

86.2 KB Created: 2021-06-28 04:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f76a69f9f4737cbd0f0785cc92dc2d2 SHA-1: 0a927b23db8c463eed3bfd507eab104fd62c480a SHA-256: 6e053ed8bb063d773254639aa31ad82bf01a4a17693c24e9b051223b3cfe3a53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b63e1a3ab---20725541251.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe3cd13d60---51174368924.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/b0noaobtdtqgao8gvq9e20qqsn/80539752877.pdf
    • https://badrivishal.com/media/92853645850.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/af2cf67322310bc273fa83db28f10322/pabopepadusitunewo.pdf
    • http://fenotropil.ru/userfiles/file/46730441061.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a75b2da0469---93788586604.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/aapp29mb9g4mor4s2gos8rflu7/47370433741.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e7ebe274---81765906566.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c1b61620065cd3c6203a245bc94df20f/dudori.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6eefce298---zezowodafolopisorufoke.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9edbaca2f6---14424070224.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3216ca60c0---jeruxisi.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/78956493846.pdf
    • https://aplusadvance.com/naver_editor/data/file/zivixiwisorezokiduxak.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/naqk6u5mniro10h7l9rfkuh5c6/joloxasevafanin.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc464ae5f---sogukunijut.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3bj2fcecnn16npk5s43s16c03/10042652198.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/acca8c1de3f34e8e9715eba2850f38b1/losezis.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fecf2b1257---86114947268.pdf
    • https://ortechindustries.ca/ci/userfiles/files/68195809344.pdf
    • http://sgrappresentanze.eu/userfiles/files/bijamufi.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7f04cb85---39407327328.pdf
    • http://ca1970.com/clients/10044/File/fuvuxaroxazokum.pdf
    • http://renovator.cz/files/file/gulinorixulokir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=counter+indemnity+meaning
    • 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_off0000ed0e.bin
a8a8c9ce7ff7b1d18776305fce7c1b215f056d635bcb2681e6e61eb69cca72ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 10620 bytes
font_01_sfnt_off00010527.bin
c365e425357ca21264a3d1e61d8307a062bbb596d704d0de181280264ebaada3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 17168 bytes
font_02_sfnt_off000131f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131F0 16792 bytes

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