Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a46e6811cf0d12c…

MALICIOUS

PDF

98.0 KB Created: 2021-07-14 04:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa3e313851394b152617f03804769d14 SHA-1: 9d75d586ea4ad44a09997789518fda8a460dbd66 SHA-256: 0a46e6811cf0d12c45dda64aa7c7b655eaa675b8d619cce465e2a2a4d929a3aa
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The document contains numerous external URIs pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the overall structure and URL patterns strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=where+does+photosynthesis+occur+in+cyanobacteria PDF link annotation
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/kkqo8utdm2p94ahi59ruab88d4/68093821810.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/74977126506.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b5e0adb6021f05e7553b59a069baa5ee/zovenom.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/fexuzowokidironuk.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/guntoskc1kj4h924elvu0krjj2/komek.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869ba81584a---zumijugawubed.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba5469411---fekolozewofekiperaxexineb.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/zigatamovapob.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/muxakozo.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/16062788204.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210506155808334.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e7c363109---17891772517.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f97f697de---18808496208.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/dtvuumg404tlsd99l982elul71/77208108866.pdfIn PDF document text
    • http://cichanski.com/Upload/file/76877035141.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9e6bd9c5---mosiw.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d7817d18b---62202613281.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/f6a7e80eff493fc3230e743852754d44/purijuvobewonokifok.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/346a490ca53f2c5ad505cdaf49f51b92/63651359060.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/runopejofopuguxopozatewoj.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/m2su0tdoc7c48k392u6nb0o7dn/kamifopojetarizusexomemu.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/vudotugogelalugap.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/vuzutogap.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/kakiwaju.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/nawafisivajibumogaw.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001343b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343B 17128 bytes
SHA-256: aef7b3bdfd047b4143bb11b35c0cda24475e306b5c50b7c1919ae1d5bdbaf462
font_02_sfnt_off00016109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16109 10912 bytes
SHA-256: cc0f6fa94e994c36274921337b125a3f1f0e8d990c41d16a3b5ed60f08706725

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