Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9586f6a2b21213…

MALICIOUS

PDF

106.0 KB Created: 2021-09-02 01:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9e2ae82a0fe493a434ff572e3da91f0 SHA-1: 0da3f57671e4b110d8868670fd859d3a633433c1 SHA-256: ef9586f6a2b212134793192ce5da46b3507d7330d372789d6d7a74e6be5c639f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to websites hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=fifty+shades+of+grey+2+full+movie+free+online PDF link annotation
    • https://ldcpc.com/ckfinder/userfiles/files/16672869393.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b2439885198---zivazeb.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210608005641_agmj0k.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/tegogifofijuropawevezal.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/viruxamufilu.pdfIn PDF document text
    • https://greenvision.vn/hinhanh_fckeditor/file/xatowuwofidakakadewuza.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021591010124589.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/74997039952.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ab7f7d0fa06e0a133098ac7722c5247e/14701263311.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/61938552271.pdfIn PDF document text
    • https://bursac.net/userfiles/file/24314591129.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/giveradazufoturav.pdfIn PDF document text
    • http://klassn.com/ckfinder/userfiles/files/dizuwexim.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/sesasodulipas.pdfIn PDF document text
    • http://elma1.ru/!upload/files/xigodexufadupefilozaj.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7909ea6485---28385577986.pdfIn PDF document text
    • http://3sdent.com/upload/files/zatijudijexexa.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbf9f96248---91784457406.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac91e923ce---99552569824.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/zeranoxowelesodaj.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/52253809456.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/83551519428.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcda347d5d---zanorasoja.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/denazesifumerev.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_off0001358c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358C 11176 bytes
SHA-256: c146d88bb55d730e9ae7086f33315f55fec22a98f7b35dc912d2f000361e73f5
font_01_sfnt_off00014f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5A 18940 bytes
SHA-256: 124287da9686f312cd28eca673f6483ade87b70f3b5b18342db36bbc4b56210f
font_02_sfnt_off0001813f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1813F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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