Malicious PDF — malware analysis report

Static analysis result for SHA-256 21070759c7819032…

MALICIOUS

PDF

98.4 KB Created: 2021-07-19 00:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f95371f416d5f04509a1382b6615e7f5 SHA-1: f9c3e50e9494ad54b596f9f60067aba58ea6665d SHA-256: 21070759c7819032a5e6be8d4cbf58721c8ab91c8e86ff8bcaa5cf2d12adccaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised websites and disposable hosting, characteristic of a link farm used to distribute malicious content or conduct phishing. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/t95dl7vj578maubpec33ph2hpe/tinitimonolidorujalonafu.pdf In PDF document text
    • http://vce34.ru/attachments/file/sonibezibinirusigexe.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/kipuwamutifu.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/27867072840.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/48695283186.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/6555995534.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/pajeletuj.pdfIn PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/66852932667.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a8e553f85---zovanegubonunovelusuz.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/65071000697.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1a009f421b6694c37f01df155f30c781/93355985972.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef4e720d08---mowovopor.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/mazoropupisusoxi.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/21285835659.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rjd9inlbqpadg1fb20mspjd9ps/46099672937.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/aa90c52c81bec7d9ec8f3ff1345959e8/57641498519.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/9a6a50f734557fc7488b3ae06ac774f7/15469061401.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/a5g89b7u39547qoj2abn6s8tqs/zinitin.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9874badad---34092996206.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/lesatuvemozenow.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/xonugudozorapuraxuru.pdfIn PDF document text
    • http://kleiberit.ru/files/file/wabezevuzidebujebadag.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/boloseludi.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6069d18712---zamuregimibuwironokereki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=who%27s+that+pokemon+quiz+answersPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 10984 bytes
SHA-256: 4baf18e9f7b96ae42589e819ff4ca62a66a228912e997305c38ba751665b406f
font_01_sfnt_off000105d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D8 2700 bytes
SHA-256: 68b58aa2822fb8fba4120f3d90122a8d1b989851e493a8c5b20e61a7cdc9309b
font_02_sfnt_off0001113a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001294b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294B 17848 bytes
SHA-256: e7b17dea6b83476e3254088b6b7995ee0db044a9b3462dbc0673c318b1674606
font_04_sfnt_off000144da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DA 22140 bytes
SHA-256: 2c56bb41f61c594dbec22cc677c5a5180e2f61de35aba164b214865301880cde

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