Malicious PDF — malware analysis report

Static analysis result for SHA-256 06af6ba135ea7dbb…

MALICIOUS

PDF

83.8 KB Created: 2021-10-10 08:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bfca396860b22a9a3049a85f0cdab0c9 SHA-1: 02f0cfe676667ba4b1d535e2ae5a32099a973af2 SHA-256: 06af6ba135ea7dbbfaf352d9c4e94fa02cfe106ad254331914e63fefe912e8f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of ML and ClamAV detections, along with heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM', strongly suggests malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the overall detection profile point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=gumble+guides+hypixel+skyblock PDF link annotation
    • http://karimeh.com/public/userfiles/file/noletelevumolekigigurora.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9ffc9aee9---18114467348.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/vodepozedepijozovu.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/monimera.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/rizej.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/67817196775.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/84272152862.pdfIn PDF document text
    • http://martonelektro.hu/files/file/dodedupurefamemix.pdfIn PDF document text
    • http://tyextractor.com/d/files/vekegenomugim.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/zuniz.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/29542257902.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/tixiwar.pdfIn PDF document text
    • http://modern-pro.ru/files/file/roludowego.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4spjvdn1igrchl18d8keu02mee/wawuzekawexan.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210930072754.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/1gdehjjmpqmqf3bj0h9ns1e4u3/linuxa.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/87207821051.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/soremeganuponodoxej.pdfIn PDF document text
    • https://toocapen.com/files/zizowevidogepoxidum.pdfIn PDF document text
    • http://gewald.ru/content/Files/zilovuruviwebolafupu.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/zesowerovujib.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/59100720237.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/vilisuzolasise.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_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 20380 bytes
SHA-256: b3eac66b53dc9b865653a8d8736d629aef85aeb3ffeb1db8af957b6cbd19cb01
font_01_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 11084 bytes
SHA-256: 5a8c2d2dc0affdf5051da634510e98d10059b6b0bd4eb5238e385d23b53eba35
font_02_sfnt_off00012863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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