Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bfa13cb52b756e…

MALICIOUS

PDF

92.4 KB Created: 2021-07-22 07:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3afd46dd0bc730e46a57e805f95ad6bc SHA-1: 72bf50076e4d95e24dad060f21fd71dad9612cee SHA-256: 59bfa13cb52b756ecb70669c884649d4d52b5df69404f17ed465beac3ebfb146
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs suggest a lure related to software credentials, likely aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed65178252---genepizidalebixisewijod.pdf In PDF document text
    • http://alliance-ic.ru/uploads/file/66905843870.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/kumulufujab.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16094755ac341c---foregividomen.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160796fa7ad353---10087761695.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/99217008768.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f88e31e51d---besokujofe.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/62923675330.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b8bc1b8d3---41644735276.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c52eb786c1491e31dac68b9ffd9d879d/tozivufevaratavijudifor.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d404b4fe66c90f56477f83a8ade33f95/lefuvida.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/togugowoxepakedafifewe.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/bamomi.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/rezalozososopifame.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/35b95bf2a2a2f5e8c1f7120bf897a0c1/12113397535.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/57127406811.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1f31165c---71002486774.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3c1b9dca6---82043130798.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bf90cea28fc9696d56aa00998dc75f31/dobumilevedamegefomim.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/45790753656.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3fbb04f7ed---52535507861.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9edd88f022---97291092965.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/8899011603.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160736dd1d1ef1---7446950173.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/25524015295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=email+and+password+for+filmora+xPDF 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_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 18240 bytes
SHA-256: 2c0c35fef4940ba94a79cac2a6144e32968e2885d6806f96de6e54eacf0b4b5f
font_01_sfnt_off0001328f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328F 10600 bytes
SHA-256: 1491a771d1967a07df599866c6cf2a81a4bef4163737d2d162bcc4218fcbcd98
font_02_sfnt_off00014ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1