Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3627e26138160f5…

MALICIOUS

PDF

89.7 KB Created: 2021-09-10 08:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5024b3505a9cef5937d3987389f9c4d SHA-1: 3692d23784f40abc4293fed881314e156c9b612c SHA-256: a3627e26138160f55186d734f3437b6e5c93b0bb45b7b211122b0a0df3103b2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm pointing to external URLs. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggest the links are hosted on compromised or disposable infrastructure, typical of phishing or malware distribution campaigns. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inverpalmas.com/aym_image/files/34261553174.pdf In PDF document text
    • https://gplacestracker.com/userfiles/file/dawakejelawibujeragu.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/97514761311.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/sumezadivajile.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16137d86121032---3794139905.pdfIn PDF document text
    • http://contelex.it/userfiles/files/24734245171.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/75392742269.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/gefenuvofimekikes.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/bikoletenoja.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad5323943c---2143418900.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161386f0cb50f7---29628264135.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/30873702278.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/57685048801.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/xoduxadepejof.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/59948718821.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/68236078178.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/28204224218.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/sezakezoxabojenum.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/9s2cic5lbvs45kl98am07kh7so/zadukimokajize.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/sovewem.pdfIn PDF document text
    • http://yuha.be/_files/file/79990042758.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/saruvonasavavikirudawules.pdfIn PDF document text
    • http://dfanchem.com/upload/files/nemuretobuvofubadogiwerex.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/goxagisanugutapoxipemaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=slimmest+phone+in+bangladeshPDF 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_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 19708 bytes
SHA-256: 418f5d6db4b6983353f2a0cdf4047d98038d6eae85a0582a266c6a177b191b6e
font_01_sfnt_off00012690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA7 10952 bytes
SHA-256: bb8f80d27c9c1d56eeeabad7de0542077f261613309acb264b8d7662cc37edd0

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