Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d25bc8e486b1c4…

MALICIOUS

PDF

68.7 KB Created: 2021-10-03 04:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 013d32ad608ddb6887b3db4538b60eee SHA-1: 45cef83dc5699ec386f6d7582ca1b9d836b56f3d SHA-256: 04d25bc8e486b1c46ac310fe98114f34bfa6797998a1d7115a69c6727683a4af
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing or malware distribution, with multiple heuristics indicating it's a link farm pointing to potentially compromised hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://minhledtran.com/luutru/files/44726683061.pdf In PDF document text
    • http://hykylalumni.org/userfiles/22562767331.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109060623108459.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/54533189179.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/ditalafesolalimis.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161395506bced6---97893030939.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/gomagi.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/xapopore.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/ginaduxowoximodipusojuw.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210913_184842.pdfIn PDF document text
    • http://xprchemical.com/upload/files/74064743818.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/gazepapupitanak.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/webunarobawak.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/73329332090.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/co8aiushcjufis4tk711rpu863/50330099930.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/4d67qvg3smqo6on4oopb1b8c71/65746858194.pdfIn PDF document text
    • https://majubesar.org/contents/files/wazuri.pdfIn PDF document text
    • http://magischtheater.nl/userfiles/file/rodutixogaxosuzarojabuk.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/94658526448.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/13021102693.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202110030609174642.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/tesomijimitinoxub.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/8589006492.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/9043311840.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/jekisezafojutepuguwum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=complete+reference+c+sharp+4.0+pdf+free+downloadPDF 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_off0000af8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A1 11176 bytes
SHA-256: e3b0a629125ea9af06044cb0a47db3b1850fb12dbd8a6f4cafea8da042483d3d
font_02_sfnt_off0000e1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 14068 bytes
SHA-256: a16b0b115b78f5b486b4e54e0b65f70d90a7d5d49613dab157f5f5e70cc3e5d6

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