Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f310c970aec765…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 00:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a76d87c2cd880a3f7c3fc4e5501c910 SHA-1: ab50afb871028a6b239e4bcb8a229d76984d311f SHA-256: f2f310c970aec765f76cd16e678f6f48d1a369f1163123dd07821fe4df521ecc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://wideanglepackaging.com/ckfinder/userfiles/files/gojowowufes.pdf In PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/e3u5crr0sjcn8hmreq2i727pu6/29885989502.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d10074ea3---jajukoruze.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160783fd41e53a---divaviravomoj.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/73864085003.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9e0d62eb87203cd6e7a981f90745f7b4/26009316639.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/tamigufixawenozeno.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b7dc4db96---21905386934.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160739f3c08c25---59953252699.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4736eb1836603a46ece02447908e69e0/pozaxow.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607870aa8eca2---vibamamazorumabadanego.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/zakizad.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/fiwuxetefifixilovarugo.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/watedana.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/porulukuxi.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/49379042341.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093271ca0801---36576626458.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/v78fp97n0s9o52t5c6gh4islfb/pilojedeka.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/983qksf2e9l5ljhqjb1ugui9kk/dotavizebiv.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8647fb1260---42242888428.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/rogedoro.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/zanivi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/24681823082.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/30300963425.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/366f2704e367b7f99ac840c9a7df7504/90579125585.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/6qp37kn6nkhndaqh1rl15hrs36/99019918069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=computer+sample+paper+class+10+2021+code+402+with+solutionPDF 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_off0000e986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 18384 bytes
SHA-256: a324eaeedfb2f7a163f755f3105fc3c1221c96dd8f057ee0aa502dfc8711508d
font_01_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 11368 bytes
SHA-256: 785c4eccf374902af1730e5fcbe151426b43d28588ce079f8170ff00aca00c60
font_02_sfnt_off000133f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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