Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff6ccc635e7acd6…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 23:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78b40110592ce842a4b69eae75049470 SHA-1: 3cdedda4760ad9ec842c9a521686604cd0bf707e SHA-256: dff6ccc635e7acd6ffd96461d6988be2732168427f21a00387b440bf7cdcca06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=need+for+speed+psp+iso PDF link annotation
    • https://astefin.ro/ckfinder/userfiles/files/58468942963.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/jopubikevupawolavudubebi.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/66477175868.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/zirikaga.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/35044917681.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/12896574551.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ab59e937f---jusenujaburifefopereret.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/87654822713.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/35380784124.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161302e0d989af---85458455176.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/74432756652.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9a975205ea418ea73d0831de1ffce5b5/womuxojidig.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/pemuwobolikosafizi.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/57155090309.pdfIn PDF document text
    • https://hoavily.com/uploads/files/27014513957.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/12809564592.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/kademanogax.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/muxigoporogu.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/zuvapomo.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/kiweragugidudabapiwin.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/93552386323.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/38897434863.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/19796405846.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ab0a8a6202643371e0be89d1138cd4d9/tuxokirozopevuton.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_off0000d3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C0 17868 bytes
SHA-256: a5812e8c5b58a59c56c53e4200a3c6b0ea9a5ede704faa2d236047b2e50dc57e
font_01_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 10056 bytes
SHA-256: 945957d7f7c6bdbb40f021b766dd1536605e856a375b2dbb2317b2fa9edb539b
font_02_sfnt_off000118c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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