Malicious PDF — malware analysis report

Static analysis result for SHA-256 95468dc136d3d484…

MALICIOUS

PDF

94.8 KB Created: 2021-07-06 19:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d97025f2f6c74217c8f735a5f76ed527 SHA-1: 483b56aa64bcbb3dca71ae45dc9c354229d2f8c1 SHA-256: 95468dc136d3d48455b200dfc1c8949cad4c1ed892aeb511dd95a2741d3f0796
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely to lure users into downloading further malicious content or falling victim to phishing schemes. The presence of multiple links on disposable or compromised hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aeronautike.com/userfiles/file/kogabigez.pdf In PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/26476497000.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/b0c99c6357b252c0c0129f06a07cf884/jegipetigekupubu.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/68418812678.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d1531a95f---49143781423.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061808575536.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/64dad65b7c0eb4862e71c03aaf26d5af/suzozofedebekemirurebuw.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f9312da33f5c39a5792a243eff371229/bolirixojebujuxopapovod.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4c9016821964e5b35ad17d1ce8b8f8f4/33136306353.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/s7sdknmg5n0jdhicfq0aee8o64/zegudojitonovekotalez.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/eda56c0332f1f4ff17b2c359b5af2c83/bizubipibuwaledi.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/34af9536838ee46c4eea5fea4d8e1230/gaxivobomunajutomulufimof.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/57029147863.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a94dd3a46f---28127011434.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/qsihblp6jf65b8ks72v2d5o745/67618876010.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/ragejumukig.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075250541c93---95966600250.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/ad7679217613fce492d42e766f5a729a/44627096848.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/86847287075.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160744bab1c9da---19066498741.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/tenopenalewurus.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b0657566983---netisenulega.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/wewugebaxipolapuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=risk+for+infection+related+to+surgical+incision+care+planPDF 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_off00010ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD8 18512 bytes
SHA-256: c32511feeeda81d18a89c63e59954066e6d2802e06c3d427b882b1685e1ebf28
font_01_sfnt_off00013bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFA 11032 bytes
SHA-256: 7be380cf15139d3581c2c156d157cde339216bde6e2e49ed435cc4dbcaf50330
font_02_sfnt_off00015599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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