Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b44af1dabbd195…

MALICIOUS

PDF

93.0 KB Created: 2021-07-27 11:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 714f571460fd55b23d42f9ea588decde SHA-1: 9d49f730245e39c9b2505ed0eba349f973ad7daf SHA-256: e4b44af1dabbd195215c526f9c370e07649ca0ba05c3734bc045a2e01bb8e8da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF contains a link farm pointing to numerous compromised WordPress sites, likely intended to distribute malware or lead users to phishing pages. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The PDF's structure and embedded links suggest it's part of a campaign to lure users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f63e0c79e10---3691876631.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79ea6237a8---berejusiroweza.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf27edbd94---kimub.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/80df4f479e69e91b5d277f4a240297d9/zejukevaj.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076608507ca9---fikefemobisarutoxinower.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/zuxuxoj.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b99dc223e---xidexoke.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mp91et1464ip7g8q36nta1itv5/49785678607.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f11869b80f5---16143168028.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/ribuwetusul.pdfIn PDF document text
    • http://erex.hu/upload/file/peniwotisexosumoj.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16204359390678.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/nivuvejiwejuforuxarikob.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98663537192.pdfIn PDF document text
    • https://hse.tw/upload/file/banufefezuwomitorazitat.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b87b8b06d8---42042500853.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/sjcrgf6smm13m2t1s63eo6lrdb/32200708787.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/9ddd1c51a9ebbf18be283f86018e7757/sonanarosidubarixobumaf.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/23426778167.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/11713509687.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e522f5bd43a94d900ba918b42db3c589/52440934014.pdfIn PDF document text
    • https://bataretak.com/img/files/file/19552889670.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160761597d3c70---90805300289.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/18493076379.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160f56c19a202e---kakelevifepe.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/liwelumafufagorenikiw.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082bf95dc547---75104621732.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/779efee2e7a7ab5fdb5a56c03c5d1a46/xojibogadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+pass+motorcycle+driving+test+californiaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10533 17420 bytes
SHA-256: d12ba76213a0ac4cafb7f2a68c7162671448b7f70908ca73ce4f66dde87ff8e1
font_01_sfnt_off00013304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13304 11220 bytes
SHA-256: 8982eaf41c98b21a3553b3d910860730f1b6c27688e830eb04e872eb092bbb91
font_02_sfnt_off00014d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1