Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d76880c7899a6dc…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 06:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7154c687143ffd2ca9f2c24ab5d80c32 SHA-1: 16ebb9e8f4fe73712831a45c4fdbee0f1f4d9343 SHA-256: 4d76880c7899a6dcca8231e4c51772640da3513894af113b03388d79ad992f73
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/8fa5f76d9adb4ea775ea17eaf4501aad/48293202992.pdf In PDF document text
    • http://change4best.ru/upload/file/togifajodofuf.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/xajumitemewunusoxevebu.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/q2ne17cujikchpae0oe2kosls3/89770233105.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/68346306613.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/fukitazi.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107bf44a3127---zofivibukatomon.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/30501687226.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/5435d51e29dbb85cd1382f1b78cb02cd/71287410946.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/43361337757.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/65510047868.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160874bae6bb5a---mokivosavexizotuline.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/kufixatarep.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/72186442585.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/21238090050.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/fb95bsk5kk2hoi5ljuf75en7i1/fasuxupixedotim.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845deda0132---pekebazuxuson.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ff7399b09---malegofemuguw.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/bilarokapozigeguwufosi.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/lusapujowebaw.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/64556439815.pdfIn PDF document text
    • http://ombs.ru/uploads/files/4762745399.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/bakokemelerevepoteme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+meaning+urban+dictionaryPDF 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_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 10960 bytes
SHA-256: 433490f28da1728a5a27def951e8f378ce644fbd586420d4f7735012c2a081c3
font_01_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 18264 bytes
SHA-256: bb444bb74e54511d187bbb59fdf2601e869513bf2e0079e2fb5155c99bf28c3a

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