Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c88c96022fb4b5…

MALICIOUS

PDF

92.2 KB Created: 2021-07-31 01:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3077b54538859d4d2af93cdba15d2a4d SHA-1: 2abddd8b32291d37c9360ba6c7f6c7c7ca6bd67c SHA-256: 13c88c96022fb4b5f7e4c255c2688321e70a5ded82a73391d70ed0749ad75b3a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://accuratesearch.com/userfiles/file/15318990068.pdf In PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ec5738bc65578f6ac2e4e2b4b388747d/vixesaxoxuxoso.pdfIn PDF document text
    • http://pneusmarene.it/images/file/ratepixulunomexel.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dadef37d4---wemeguxoxigevezitafodevil.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/74328417095.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/c92ma85sqqh9rnc5g13c2tjs76/jubikukatisamifixenufij.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/sagovakesoligarodopis.pdfIn PDF document text
    • https://shopabrang.com/images/files/39040560917.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffcf863e654---tewilegiretowamolefax.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/79442557953.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16085360024807---606863924.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/nepeliguvire.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/56463969086.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/31511552343.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/vonulakafolem.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e806b298d6100196c3dc994d8830a4db/33193681436.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/teroninixiperinojoxuved.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/57719030095.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/rojijinapalaju.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085e7262ec44---burabuwotaloraxuxupa.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/lononulugon.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e3ab62cbc---dafuvepususinesivo.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/e04e7da75d4146aac9b0e8aeafba5876/wineb.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/gusenagabade.pdfIn PDF document text
    • http://fotossc.pl/_files/file/suvez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=student+exploration+food+chain+gizmo+answer+key+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 17376 bytes
SHA-256: 027b95b0fd9e2c787f410c40d1a7c045f2ca3d2e27b7fa8eed8f76b8dd278391
font_01_sfnt_off000118c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C1 16212 bytes
SHA-256: 87088d3577d9d050c4a7591e7606cd6c33fab7e0b2ac80593eae1a57c5dc7e17
font_02_sfnt_off00012e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E95 11696 bytes
SHA-256: 745382fe1b726c7886c9e7bee1c6a56f64519bafdd2d4ca20348c1a85d7aa5c4
font_03_sfnt_off00014a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1