Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf7cc1000adeafe…

MALICIOUS

PDF

103.1 KB Created: 2021-08-11 12:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: fbab0b69c9faa003b1228705ee0ac367 SHA-1: 15092b3059bbb67dd87b838cdc885ee3d57167a2 SHA-256: 4bf7cc1000adeafedc34be899209af19a5e85379866eac86f502ff1349c1f3f6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious or phishing content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/f18e8caf13abf521550262b1caf2c2f2/patis.pdf In PDF document text
    • http://msslink.ru/userfiles/files/kawogimatevitiboxasevogin.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/80538754948.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b9beb1d71---84482606496.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/kewolilezubipot.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef3607108---rolabitoves.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/01872a0a4c837c8923dfe807ba40e088/85012190659.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/75939065032.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ebfb0789ea3acb144a1700bfcf196135/96172766321.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/nr51p1br1s8cjtru6n97ajgcms/gukogofu.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/kemopalefa.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/deef7d60d3bfe2646de2f267229d73ba/51663178998.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/43587010342.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/waxadipi.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/73573747352.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e60e7439e61---74129353307.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/7fa68ecae3aafd4108d52b9eef1842a7/88771581032.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/ba8c83b1900c5b6c259c2cb85b67cd21/duginiwuweduveni.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1d2aaad53---25205586233.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/sp84trves0bpk6t85i0itro5u2/51950293825.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/0c6a5bb2d457ab5a0f36e0270cdd8f72/dizujiradesutetito.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1e49c92df4---tojewitudufas.pdfIn PDF document text
    • https://casentinoshopping.it/file/61513825061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=samson+agonistes+full+text+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_off00013268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13268 11020 bytes
SHA-256: 41c0d640345bd9e3c4730a14f0aa686764ffda6320cd214aac9cc598792f2bf5
font_01_sfnt_off00014bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCE 16196 bytes
SHA-256: 6e25337b6069f38ed002e2dc19af6145632988634d099c1463b16afd5649b555
font_02_sfnt_off0001755b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1755B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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