Malicious PDF — malware analysis report

Static analysis result for SHA-256 50871ef4059ff228…

MALICIOUS

PDF

108.2 KB Created: 2021-06-27 09:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba7ae6d792c2e977cc6a89e7f5a2c1b6 SHA-1: 9b9cf88560694eed0ef2d086d1a4eb0eee168b4e SHA-256: 50871ef4059ff228888a0eeec7699bd8ab7fe9f0796905548840a4229f8b2373
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jnl2ssr5fbp6cd76rsnvjj8594/dirowifos.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0edb59c5---27854241264.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2f00d1d2---vilumerer.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160757a3429030---93633867482.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccee906a1e---wekexenavatakaguroropozi.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/34c9bf4a36b6ff118a0fa16d6282fdd8/tirejowusafexe.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee0eadb82---16354213741.pdf
    • https://delphin-bau.com/ckfinder/upload/files/98678518503.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcad0471642---pagomega.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe28a7035---45682159319.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa17385d65f---36623656681.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4ab053790695e3bcce84548664beb011/73877466946.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a095b90392---tirezoje.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721327d7c79---wanadonivut.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c91f5d1261b---pinonekiwirozedu.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a711713b3e5---85890883865.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aa87a4599---kutusonekiloka.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/90b287ab1d606f96c03bdfe154078ef7/50876850389.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a863dfbc4a6---subirutogovilagotedaxodi.pdf
    • https://mimpishiosatu.com/contents//files/57886401580.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca1804343a---kuxulomivujugekep.pdf
    • http://www.hangmandigital.com/files/file/tuwoweriril.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+are+you+answer+in+creative+way
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e19.bin
706243935c2af39ad3ed114d97d3df66c020df1cd1eb93e6594f68323d360e2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E19 10536 bytes
font_01_sfnt_off0001464a.bin
dafb665c2a0bc100f73d537955fc3ab06b737f68d1f0065c687af666231150ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1464A 17700 bytes
font_02_sfnt_off0001743d.bin
7d49912755a16236c2b403c2e12f26bd1566b313ec72bea38639ae55f401c9a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1743D 16836 bytes
font_03_sfnt_off00018b14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18B14 16792 bytes

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