Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3915b82ec345e9…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 17:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff31fd55e39b4772abcdeaff8266e519 SHA-1: 0942538dfff9c3b7b3a9a36cd151d843824c055d SHA-256: 1b3915b82ec345e9345162191d3d70c503d5a7ad04082a160d5767d315c7c96b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs that form a link farm, with several pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The PDF structure itself is indicative of a link farm rather than a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://drafthe.ru/uplcv?utm_term=fabrication+acide+sulfurique+pdf PDF link annotation
    • https://smsenerji.com/resimler/files/lobekasajubokupodexevab.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/lizapakekimuwamujagego.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/88281254414.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/87473287861.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/29726261500.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/ximezibobigodojerose.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/31389882296.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/61124948295.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/mijujavunesulumugofedi.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/nunixuv.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a2fd149ce---zorumipirenegamemuzator.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f191a929dc7---roposi.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/69414293396.pdfIn PDF document text
    • http://famillespourstarlight.org/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/902238694.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0987789e4b---56946217608.pdfIn PDF document text
    • http://slsnn.ru/content/files/temexade.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082b91b5ad83---pigazaluxuvurodukapij.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/3231104820.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/38024366920.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/digoroduwesug.pdfIn PDF document text
    • https://vientangluc.com/upload/files/zanakomo.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/wodukokeronubaka.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/biruxirudokezeji.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/45316351757.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_off0000d3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C8 18448 bytes
SHA-256: a8ed4e8eb3393dd96360c9050d2a5a135face7b2c0b7cc330c3109706f0b3629
font_01_sfnt_off0001025e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A75 10976 bytes
SHA-256: d7accbe9188c78d86898699f38628c198d755ba462e3d89fadde30abc37a5b4b

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