Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c44ca0fc889975b…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 19:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 269e5c520a190f85fa5c1781487cbc44 SHA-1: 3a4389a683135be7318616d964a375594306dcc5 SHA-256: 6c44ca0fc889975b5767df03dadca53fce51423e8d6837adff689b1cd369c787
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with spearphishing attachments designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/wulupixupexegeze.pdf In PDF document text
    • http://didocrosby.com/imagenes/file/94188492807.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160854835468a6---bevegenegasekebupofa.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/652622e8053dc5a3d25bfee2f22cd4c6/tixanet.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/enhats6jcb52e8q6n3g0dondg7/soribebovoporetaxejuzaxa.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/tifalusuzima.pdfIn PDF document text
    • http://terminsk.by/pics/files/mojusikopewop.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160760be32c750---samoberiwojif.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210507032248.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/rs3b4bpei61tgvo4pknq2gamav/diveromokelalu.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/loverisikuju.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/63f45636e525bd979566587e7e8496a5/kufarojerinelajavulimosar.pdfIn PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/49471952596.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/teleferuzumuxoku.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/sfm0672p86sppf5euqm540pc49/57066101343.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/sifinifunegupokonozas.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d82722780c---mabisijudale.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/27725037808.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e770df45fc05d0bac7efb02576807887/47787392790.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4f7a9d669d3c0496aed2b0084ab5bd89/gepabanuxilimidi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/52328177071.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/xalakakid.pdfIn PDF document text
    • https://ghnservizi.com/file/51771159069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=beck+and+callPDF 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_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 19100 bytes
SHA-256: dcad4f020358956d17b8ce14e4f2685e001217a5bbc0cde6556926e8dd8f2eb0
font_01_sfnt_off000118b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B1 9932 bytes
SHA-256: 4160e54c42ba63d697919850d8a592a7d5ecf414049e6b006c288ab6c76f6786
font_02_sfnt_off00012ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1