Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c485b2e37cf851…

MALICIOUS

PDF

98.1 KB Created: 2021-08-08 11:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c999c40d21505b83a4936aecdc540e8d SHA-1: 6cda597d2045b2a397e2c724fad87303be1974c3 SHA-256: b9c485b2e37cf85116b99349f73bb0eb632c1e3acade723ed4937249ddab425c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e820b518854---83836958697.pdf In PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/59479916725.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021651317344341.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/xobipewageduvoseki.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2ed6ce362df59fae1aa86f1d95e72739/54726705878.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/35151414939.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/62492862580.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca09d8dd1---mexaniwasilevutugaboregoj.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/ruzefujaxevow.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/d73ka8kdv4skchpcd152l4q6f0/bowesefozafiwuxapuwu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/5eceea60567eb7f12eba6b4b261c3881/kimogibijemopesikevekixug.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/rofigi.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5be96cfba---zisireluzozul.pdfIn PDF document text
    • http://airsoft1.ro/files/file/48757032518.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070366e646ef---96443969341.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/7218483619.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/pipezirupatarelaroboki.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/96248745859.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/fizajibanevuturumez.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e09a45b07---28596964056.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/1628513032.pdfIn PDF document text
    • http://bvsaigonbinhduong.com/uploads/files/punapazajutuwot.pdfIn PDF document text
    • http://roocenter.ru/upload/file/76560766402.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/39373658815.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/mifufovulog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=personality+adjectives+worksheet+upper+intermediatePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/ecc74f5fd16c227890542cf4305e47e6/niwirilojewinomu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11608 11368 bytes
SHA-256: 2d8997ac52cda1e97cc7b9ae383815371e81940ee3e709f6ae430a969255ccc3
font_01_sfnt_off000130aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AA 19228 bytes
SHA-256: 10abd918f57204a096de5347a23b888c93120f90ac57b0aa022c33419f69bb4e
font_02_sfnt_off000162ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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