Malicious PDF — malware analysis report

Static analysis result for SHA-256 df01bf022d99e5a2…

MALICIOUS

PDF

74.1 KB Created: 2021-09-18 01:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 83b6bffe5986183ee244625c8c5b512a SHA-1: 14e1d3d5ee3e03d9dddf842ab528278578b4cf8a SHA-256: df01bf022d99e5a2872f10a718bd0ca895b32b02fe7845c98494f60a2fa6b86b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as downloaders for other PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings suggest a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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=bittencourt+plasma+physics PDF link annotation
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/k7amdoof4mudg85egcckqlo55k/bosumojo.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/dizozugefabopu.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/11759430051.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/vivojekijimujakujar.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/26158190655.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/wapodosazinalofuroxuv.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://www.77ice.com/upload/files/51706534542.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/sebas.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/vurixa.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/guvewumulesod.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/24557200075.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/xagogi.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/61855448778.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/sipirutiwuzigoloroga.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/loguteka.pdfIn PDF document text
    • http://htwy.com/upload/file/towejeliwosikimakifebe.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/13442942037.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/72def06ed68bdf11f3be19510b1abc63/ludedetine.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/katekezanujijewudojaro.pdfIn PDF document text
    • http://sung1.com/upload/files/jufemomoruz.pdfIn PDF document text
    • http://beta-rc.com/upload/files/80138732863.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/38309566579.pdfIn PDF document text
    • http://poultech.net/d/files/51822161293.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/kemuragis.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/45307832485.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/211367faf0f9d47e5b3faf0954a3d30f/vozepofalajotu.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a12cc834ca2b2ef599833967a5ee16e7/14444612717.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_off0000bdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAE 10908 bytes
SHA-256: fd2820b5f24b45888daf130a440d38d8fdc64b17934a791aa03538aa6c983295
font_01_sfnt_off0000d6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C8 16820 bytes
SHA-256: 71d4a57aced961d7cae9f6dc386529ebf6c55db26afa114426db8e370efd412e
font_02_sfnt_off00010278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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