Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bdb80acc300746…

MALICIOUS

PDF

86.0 KB Created: 2021-08-31 11:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b62158c5956065f90892b724a15d4ffc SHA-1: 47967145bfb33afdb6dd5d8458bb6d5f0956e05d SHA-256: c1bdb80acc30074670589aea240d2550f4c097b6c0732c1a1dc4e5608eca7b6e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI links and link farm heuristics points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://laborke.ru/uplcv?utm_term=the+misfit+of+demon+king+academy+dub+episode+1 PDF link annotation
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/repodam.pdfIn PDF document text
    • http://muszempilla.com/files/file/muzawubusez.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/10095530844.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c2dc72f9c---69454595041.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/xufunamabarerimol.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/69241585997.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/71309736949.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/31377036574.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e742d4c0c---23979310662.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/dometazubat.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/c52eca26455c12b3b5a87d36495b72d5/nijogidul.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/80073839706.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/83317019147.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/gojig.pdfIn PDF document text
    • http://24cvety.ru/upload/files/2076466420.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/9uven9fh6kpap41bkq41ob1ak1/30074543028.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb0c21ea1---50585318181.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210622_152410.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/lc3nsnrua7f180062rgit59kd0/7492272472.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/rafedelinowamazuwir.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ca34bc23---56255619532.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/patumowibunira.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/saturetojugegonapit.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094132952aa9---dujegali.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/49979267950.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/5k68ffb5fid45hdu96co7ub1ce/donadunukoxan.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/81d0f4041b62991e43ea171b2aa8f9d2/dopukesekiw.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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 11384 bytes
SHA-256: ad93e963dc8d68889486f30b247c31c7b0414529776f0e3728a9bdb2042611fb
font_01_sfnt_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 20564 bytes
SHA-256: d88d5ae44a4f57b49bf235532c137bef4261701b970a6a9aad6b5ee668be0ddc
font_02_sfnt_off00013011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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