Malicious PDF — malware analysis report

Static analysis result for SHA-256 282b6798dc2cbb9b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 17:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 40f82613b38c66c734f270cdf563dae0 SHA-1: 6cebe00c0d8c2c60c6ef68a97235c9286a24c28b SHA-256: 282b6798dc2cbb9b807e97f97bea7ca9ab40c12d93893b100fd89fa995d64ea7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of external links and the overall detection profile strongly suggest an attack pattern involving user redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=example+of+in+text+citation+pdf PDF link annotation
    • http://hongshengfish.com/uploadfiles/20210516/210516105640325236r7btop22kglg.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd608206a0---45131675427.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/21829159448.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/xevir.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a322e492738---39901883878.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/pijujufagekipizukizi.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/xalomojukemetizotirewi.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210813011503.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/310152019378.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/supesebiwegezej.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/21145614727.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/31556026687.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/zimawuwuzobojo.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/defiso.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/9794bdfa55a444d48a1830578014cba3/zanojidamuzafel.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f336f2b59e---diroku.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/67444013424.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210506093148911.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612c8c914e867---ginuxejebazog.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/98519191216.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fd0fb8993---fisavifofonexuj.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vidilanopebirumifibofeb.pdfIn PDF document text
    • 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_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 10600 bytes
SHA-256: 4593f61f22417d6e10f3fd101718ab46c1e67eeee9f56d17bc58fe0992f7e10f
font_01_sfnt_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 17688 bytes
SHA-256: 06fa40a013ea8538b6af1db70b097457932f37ceeb17512d04d85daa7d3b7cd3
font_02_sfnt_off00011d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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