Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fb1796bbfaec19…

MALICIOUS

PDF

89.0 KB Created: 2021-08-20 06:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aac5cc3630050c83b5284dd26e7e5e72 SHA-1: e3513dd71bcc205c3a7c55a72765e76dbd6f0340 SHA-256: 21fb1796bbfaec195b43d9227dfd3c6a35b4ee1f11a05f10997653ad31429884
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pistant.ru/uplcv?utm_term=al+signore+canter%C3%B2+accordi+pdf PDF link annotation
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ed0a4c93dad44d2da3b0f87a002fdfc7/fotofafalulolojadi.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/82764890503.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/fafoxotavetomodufopig.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d054db3e6d---10656099544.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d6abdda7be1---nevanibigumafiluw.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a45a2ce59---josezumidakafezutasoli.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/satedobisoresilawaz.pdfIn PDF document text
    • http://xinyuemu.net/assets/202108/files/20210820074533363207.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/762afe4235651f79d23cc8cb1edf040c/40429963300.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/xepavonofuzo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/55uh7c6noph6po4c368iq1fsj4/83629944141.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608672ccdef67---10609680728.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/fowajevozasife.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/wedaj.pdfIn PDF document text
    • https://webmenuplus.com/images/file/17408093195.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16083ae7fe0712---luposorinalogeramuziveb.pdfIn PDF document text
    • https://vijyaiprismcrm.com/userfiles/files/kudujufazufuteniw.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/09d8316adc008f9a171d553db91f8d27/27099078957.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/22639798321.pdfIn PDF document text
    • https://baongochoa.com/upload/file/22571437632.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/amkr7flabq13sniqkr0lshl9vg/muvejusuxo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609167fe2923f---jezokubakipixitimu.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5mppc8ho6l5ggh6sq6jp0s41sc/balitenupazodo.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_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE3 18432 bytes
SHA-256: 18ae96cc155e7fd465c42ce08edcb3b81d94fe9b8b9b68d6b8694c9b2dabfe0b
font_02_sfnt_off00013acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACB 10916 bytes
SHA-256: c780761b31d0ae28b77074feb38f87fe905e46ba0566c9b4f0e1569106609d22

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