Malicious PDF — malware analysis report

Static analysis result for SHA-256 1423db5a4c678ccb…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 20:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2cff0d268f624e32e38ef140889fbee7 SHA-1: 49995b7acc105b28de2acada8b52954808094619 SHA-256: 1423db5a4c678ccb6d96f65aa19dda244951c4910df70e5710deeaf580af5be2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to external resources, many of which are hosted on compromised or disposable domains. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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://medvor.ru/uplcv?utm_term=how+to+connect+hedynshine+to+music PDF link annotation
    • http://zkojicin.cz/userfiles/file/jelinetupirojoxomemulimaz.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/bizeruweropofagavulesegiz.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/suvoz.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c1913b5e2---33845210419.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/342454917.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d141ee0fa---fodabasep.pdfIn PDF document text
    • http://195exim.com/datas/files/solozobuzuj.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/f852f9122fe6caae6ffac4a9024320ee/10122625759.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/54096159898.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/d235103baaa32b3a94fd9f2948e9a850/womewegedumoraluloxagavaz.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070402b8c273---rifokukida.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/46706435717.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/todanipewin.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/wufulikokikas.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/0ltu7hoqdl7ak1dpr3nf0op0lk/wuwuvez.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96eba7a2b9---peperatebowalatufa.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/lesegopogutil.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/40i2nfgjf6m0ks4ne7b7gjjftl/16180598243.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/33b649e6fef940c2337872d882fcab3e/36522471515.pdfIn PDF document text
    • https://rajaunited.com/contents//files/gunajepazi.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/nilufebugomotowoluwe.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/37368629701.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/41935207052.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/tezojowunaginiluse.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/52655661745.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_off0000ce45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65C 10620 bytes
SHA-256: 08a5a7f0a0c9fef6263d6dd7d41b582b10d662a41b970a6455d6673dd67954b3
font_02_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 18508 bytes
SHA-256: 2019b1cd0d52c910d09e58b7db0aa7c848a94e5acf70894d38459fe8b228b309

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