Malicious PDF — malware analysis report

Static analysis result for SHA-256 886bacb7ce9518e4…

MALICIOUS

PDF

84.4 KB Created: 2021-07-03 12:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 85f42e3544940d346c1fd545565746af SHA-1: 5086ea85dcee4442d0e6cac674393774bd5d7d59 SHA-256: 886bacb7ce9518e4046266e01e386c1e6382342a214b90b5cd3d82e7757d76b5
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as containing a link farm, directing users to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs point to various domains, many of which appear to be compromised WordPress installations used for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/lche3fmq3mupas7qp7u9stmkdi/bugubiwifasujoguxaxi.pdf In PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/9pudb5tdtpc51hc4gkeohikqgr/tixidaj.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d37aca02ac---kegitetiremalenazoguvak.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/tafutedi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160864d4ddc0fe---76330179921.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e5199b39e---xuzab.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/65229019795.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/99920485541.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/9ces75enr44b0q942f9oi15j5f/nipuruvowuti.pdfIn PDF document text
    • http://biatlonbreza.sk/editorfiles/files/bunanagunipugiverujiz.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b698d20e9e---gumowesetugasidekazofup.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6eb5071f6---54133503541.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/83690091903.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a32092de24b---vixobudexovasitid.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f75f040fc344174ff51d178cb903febc/21127725204.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607940f2801a8---nutowowunojolipopuxuv.pdfPDF link annotation
    • http://sistersaviopublicschool.com/userfiles/file/losujotusekaxajusunaguxap.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/11314796714.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c5835feb14b5bc36afe13587ceb9723c/37662082956.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608432494f7ca---wugerajoseburugadali.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/74412769614.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/86902276448.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/84070628901.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/97q1a8tu6dm54e4ipqg5c5r3uo/zopugakebovewaxop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=problems+and+solutions+in+electrodynamics+pdfPDF 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_off0000e2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FB 18344 bytes
SHA-256: 53a986c520dc63244460b52398c944f9f8a455112b87271e1089318bccaab508
font_01_sfnt_off0001131b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131B 11136 bytes
SHA-256: c01b92f664863162e6c7c47e9fa308f823150b27b8195e156c6f60a3bff44407
font_02_sfnt_off00012ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1