Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a23aea140b37441…

MALICIOUS

PDF

95.7 KB Created: 2021-09-04 16:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 06ef4faa3b816cfc6de029dd1fc7eac3 SHA-1: 2491e3eaf08874f2d163209a05de5af2c6b572c3 SHA-256: 9a23aea140b37441319d6ef039fc1f4636884fb1b8e82dbb0cfb8361ad2086f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://faltprasten12.se/anvandarbilder/70/files/xaxetejoverumodejaxisaw.pdf In PDF document text
    • http://moristas.com/userfiles/files/11194135066.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/62706191090.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/67230912876.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/43284315943.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/46271157997.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d71d10010a8---bevatitalixanamopeku.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/baa20a91838beb94acbb35dcbaf354a6/botakam.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/86445737387.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/42706171243.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/rimiritoseliwonu.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5nrlal5mb6ns9qsevhk6itel96/paxeke.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161287989de5ee---dikaduparutam.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/5108064720.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/50794804310.pdfIn PDF document text
    • http://web68s.com/upload/files/nenosupuparosojoke.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/cab2e96daf3b9849ea01f59968e881bc/gununufadoj.pdfIn PDF document text
    • https://laps.pl/userfiles/file/21387557883.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/81265067950.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/lujurozikitaku.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/81197329751.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/62230461419.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/54494067442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=libros+sufismo+pdf+gratisPDF 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

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_off00010af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF6 10756 bytes
SHA-256: b775b4328f3b1c4b413450b6ae2c783608f678f94762878d27e76f9f456725a2
font_01_sfnt_off0001234c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234C 21128 bytes
SHA-256: bb66a2b668d4fe698eea6c6071c9839577701f6f616d01b9765fbbdd664121af
font_02_sfnt_off00015904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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