Malicious PDF — malware analysis report

Static analysis result for SHA-256 78185289530ec54f…

MALICIOUS

PDF

73.8 KB Created: 2021-06-26 19:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 682eccd6375d60d06a6af9ac266fde6a SHA-1: 2431a5143c5e611179791837ebc0231886c48712 SHA-256: 78185289530ec54f4437999965e2e5ed189a162958530304886e36b2ebd84af4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links are likely intended to lure users into clicking them, potentially leading to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/602b3e26590cc00d6a08cf6b433cf55a/94677630518.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/e1c9323f81e9fe6df965bf26b92525bd/daxatider.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/jcbb28ioc1j37nbp4d1ccu2cqn/58361949445.pdf
    • https://mk-sito.it/uploads/file/24629243326.pdf
    • https://ascinfratech.com/clientprojects/trading/file/17202774174.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fbbbac09f---gepiwawunadazev.pdf
    • http://aelma.com/sites/default/userfiles/file/merufemofepowefiv.pdf
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/zitapikiratilixebupezow.pdf
    • http://ottotech.center/userfiles/file/nusupobero.pdf
    • http://vagtteam.dk/userfiles/Files/zobirutavole.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160941562d0264---19943047926.pdf
    • http://ekolojikweb.net/upld/userfiles/file/9129117159.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079930621eed---97446693259.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/9guor1m0f47r51891ddcsf1v9v/36893400446.pdf
    • http://xn--om2b25zm6igqb.com/ckupload/files/rugakovokivupusigoje.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d337e57a4---61958538487.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0bbbb5d0---kasufunonoxixabeka.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7eff05a2---wujanasenavosasanif.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a495804a9b0ac0080b89f02c25fa877d/71315387145.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1424d17ea---dajogefasolem.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac1a522fda---ginofof.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ac91bf343---pagofebapajixutoto.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=if+the+momentum+of+an+electron+is+changed+by+p
    • 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_off0000b894.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB894 16792 bytes
font_01_sfnt_off0000d0ab.bin
ff30da98051a4a0641aee9aff5fb49b63b9a8b79cd93c302ccaaae6fa90b63e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AB 11372 bytes
font_02_sfnt_off0000ead8.bin
4179a7c641898ba3bd85dde91d56edbb702f3e6930e0def4744e888d000fe130
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 17396 bytes