Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48832327c530fe6…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 03:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b6185d5c7523626cb15414e05f18dd7 SHA-1: 63c929ff39bbe9233839c5379bfbd787565429fa SHA-256: a48832327c530fe61f3daa4b411ef51e6f371e3650e8b79377d013e359204e04
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of link farms, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jacksonreunion.org/clients/71346/File/29490686261.pdf In PDF document text
    • http://vimbark.sk/editor_uploads/files/13174905866.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cfdec8c27---35347565378.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/silowazus.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/fawakogepalevuregan.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af86fdd6975---jidon.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/walevem.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/58720481325.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bed3ad561d2---tovefuzijupomad.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079e68357206---19020398933.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/h4m2viflc5ropvpff72j5uab4s/sowarexexexesomudexubo.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/feramutovosati.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c016ac9bcf3---73628819563.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9e37b7866---93229882998.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/12550061036.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/dovegamupolow.pdfIn PDF document text
    • https://jjpremiers.com/files/morogebezugemowefanol.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/pf0vqlqulv24o5mna28k57qo66/kasilaworiditoleb.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/fee7461d25b1261c8086f9eac2be0780/99607818734.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/53910049567.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/koriwotixepevemixapofut.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756d76beb18---pagoxi.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/4092a8637a0cbf9b85bd22ad2dba21be/5382115023.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/lopobidudi.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/57748477342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=factorizacion+de+binomios+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_off0000bf23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF23 10912 bytes
SHA-256: 590a8f5241d25b17d9aea4487782a0f27aae46b82b03dc7e778377ea48e243de
font_01_sfnt_off0000d83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 17860 bytes
SHA-256: 2e42544ab20daadec93eb75a6c48a48050bcbbfc1d1a921b22953ec42d6d93ba

Open this report in the interactive analyzer, or submit your own file for analysis.