Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcf43206f2176a2…

MALICIOUS

PDF

87.3 KB Created: 2021-07-14 03:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f07ccde1ecb3a580c13fa2d9fed8f53b SHA-1: 29d9ce9f225a3191ee0d5c5b70c521d2486f5b2c SHA-256: dbcf43206f2176a2a44876f73fdf9b6e065726ca4bd87eb70083e6efbc304dfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=lice+and+nits+treatment+in+parlour
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095e1a29584b---xejutesijajadotiwu.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ji20u2a7ghhg1pufg33qe1t7lc/36814316750.pdf
    • http://cpk.by/ckfinder/userfiles/files/xofugesapilaromufovo.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfe0ada4bc---muxavapuxut.pdf
    • https://traffictkt.com/viking1/uploads/files/44971933939.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b077e00d692---xunafozafirotatesarefemix.pdf
    • http://begemot-rus.com/uploadfiles/file/2021051401505673499.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5e14cf3ed1bf7df248219c3ac208f174/39054641829.pdf
    • http://grandwatergatehotel.com/upfile_hotel/files/1270174191.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46345226636.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd18029fc89---vegokuzusigibe.pdf
    • https://satuldelut.ro/ckfinder/userfiles/files/kusubewezixilalipilefa.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/11640794064.pdf
    • http://megat.pl/uploaded/fck_files/file/semafis.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/m3o67hltniissshr5o09loo4j7/bomele.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/dkhqrvf6mbefevk4kikj827iku/jatilowevilixid.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/4110412075732dbd72c74d9362a18996/nixeretuleleso.pdf
    • http://vasvaripalmuzeum.hu/upload/file/nelamerurum.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/rgd3giur9qskibvgs7i393uvs0/44324215195.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/66901792308.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/migudelum.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/2249d85bb3545f2c43f2fa15cd3693ae/86726997401.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/8d3d09a137b0ffe7676e2b73a20f88b3/xegirigavamebubipag.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/tllq2047ae515s4rveti2j989b/27867494235.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_off0000f17d.bin
33965ee1f30ce7c8f7e0c663e8f1dc83f31ef1cb085c8c286add7ca5f4487130
pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 10732 bytes
font_01_sfnt_off00010a14.bin
4c3bf6cc9982ad7e189dba14ab87c0da1324e6a93a585785102a065fdd471f63
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 17516 bytes
font_02_sfnt_off000137ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137ED 16792 bytes