Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c774fbc69411a1…

MALICIOUS

PDF

95.7 KB Created: 2021-08-10 23:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 9be5f760e816dea50a6c0f0b129d437c SHA-1: 5401f2a00fb494cd2fce617e5c7d32131c2dd860 SHA-256: f1c774fbc69411a1012f13a15006611ac18110cf4da1fd4dadf48c6bd7f057c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm or phishing lure. The PDF's structure and the presence of numerous external links indicate an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://chcial.ru/uplcv?utm_term=financial+and+managerial+accounting+13th+edition+chapter+2+solutions PDF link annotation
    • http://korean-school.hu/hangul/userfiles/file/94617377201.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/22637042089.pdfIn PDF document text
    • https://triosms.com/userfiles/file/46115536665.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/32b6901f00d9555f2da6494d0c75cc03/xaxid.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/15613823494.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/witezinawadexewisil.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/wudiwabuxixifipo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/lavoturomadeser.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/17848180553.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607af52f80cbd---manevasav.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/q3q8pshvaoghus1r6dn9h92oj8/57604759728.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/29012471411.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ctie5hng7dfvp4lgtfg95ip633/lezegazijinebawupo.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4a9c1c681---pasalebagiperesufetamig.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/kixorizaguwulolinijud.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/aae4e5d7c1723352abe8aafffa2da3bf/zudax.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/gisajileladulisiweludop.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/18835790699.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/87102158899.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/117d2cf11cc74782fd02e08a42959a39/safusajeninoxotuneru.pdfIn PDF document text
    • http://df-foundry.net/d/files/junidi.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/donufijenonetipuw.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210807223604_buoicg.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/xawebomidosiduf.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_off0001094d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094D 18688 bytes
SHA-256: 5b794a43d22dd67294faa3c6a7283b4a344032e90553d788b691870069a3f562
font_01_sfnt_off00013b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1F 11384 bytes
SHA-256: dcc2d95b82024bc589993e97420cc6c95e6fb9df8fef6a076f3b4d483cc1760c
font_02_sfnt_off000155a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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