Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c2ef463112c2a1…

MALICIOUS

PDF

72.3 KB Created: 2021-09-06 08:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cae4ed3807109508dea17ee3b0f95921 SHA-1: c57d25bc2b37f7eba4991b89d63d863ee082370c SHA-256: f5c2ef463112c2a1cbbb28e584ad84b725951c3c06dafa5d4538d668e9b65af8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to lead the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://laborke.ru/uplcv?utm_term=minhajul+muslim+vol+2+pdf PDF link annotation
    • http://studiofelician.com/userfiles/files/97457033979.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/36111347485.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16094b6f8e1fc2---91509443157.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/wopekujape.pdfIn PDF document text
    • https://aokman-drive.com/d/files/36422821364.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/jolerakonozinopofewoda.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3359897ab7---gapiwebetanuwavarasizoke.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/51752800728.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/rloaeeablvkgcifivdhr53inl1/takinepowukew.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/4934220322.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/meririsifawavomi.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9695f89f98609d745f5c2dfa2b50fe7c/4158884762.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3e415c17b0062f98ab74695bc649577d/daxalekire.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/39077015464.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/maximewusejexukoj.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a770413cf37---pazudibatir.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/ximiwagadaba.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160829e519e41d---32592081243.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210823_B8989B0B5134FFDE.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/simadinofosemiwigexigik.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/28487448975.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b069405e1---74677417626.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_off0000b734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB734 16860 bytes
SHA-256: 4b76287aab2835037e187bbf68b1ac1343351375c5260a456be156480de86670
font_01_sfnt_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 10844 bytes
SHA-256: 45d6ab57e8ca9c548238f2d0f98d98762a5fcc42fee37b1ffe16322b05910654
font_02_sfnt_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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