Malicious PDF — malware analysis report

Static analysis result for SHA-256 98951ec49ecacf75…

MALICIOUS

PDF

84.4 KB Created: 2021-08-10 23:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6758be08b8d1e30b4cd9622c18f390b3 SHA-1: 90b513800db160ff81d340d7c1a20f6b369b7384 SHA-256: 98951ec49ecacf75c0ae56b45d26d14827901d62e93fb67ee4db56d4db0f4b2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://wenxuezj.com/images/File/gamonikodunuvuvak.pdf In PDF document text
    • http://argol-editions.fr/userfiles/file/44779952170.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/duzaletaluti.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e825a0324---71494477802.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/43033656098.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/dujuw.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/wuxesivasege.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/59181084246.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/fixobosigalebukelajuwib.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/tumolefukenij.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/65424627280.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cd90ac4dc3e---jorikapejuwokitumudaj.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0af1d6aa4f83316473181b5aaa6754df/gagajugarari.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/495q6l7758r8eg1ia82iqi9slo/wajuxatokubupaferivej.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/dc963b20eb86312e3263605d95421805/kirojalafogevukaxar.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/ca245999aa0df5e5cd14dfaf291993d1/82146523861.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/2793775433.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/wifubosulaninapof.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/radige.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/60009845296.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae06eaca03a---30946147879.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d6f67b3e9b9aba02f0fab94ac4b2ad9c/nipunanapuxolazawe.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b5604673---zesimewurufixatarigur.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b1dfe4cbed3---85472148582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+free+roblox+accountPDF 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_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 17204 bytes
SHA-256: c62bd9764b3a0031ad7e9de3800c5a4c205a96dd445664e0a84462bd1247f4b7
font_01_sfnt_off0001135e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 10668 bytes
SHA-256: 7d6c6075b99766412a85c8cd55e2987a0714e0344237a1c98d194b439e833d3c
font_02_sfnt_off00012c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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