Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a70175640f44b7…

MALICIOUS

PDF

74.4 KB Created: 2021-09-18 10:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a4d7bb078d06eff09c6d13d177655a3 SHA-1: 92945018b14102f077d8e3e779070d6354994fce SHA-256: d6a70175640f44b7e9845ad032078872fc69e3f0f7ac3fdd2b8cab1a42838477
164 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation attempts to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=block+craft+3d+mod+apk+unlimited+gems+download PDF link annotation
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf95d2faa---58047204600.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/90789699869.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/91439724353.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/49021253388.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/58143780184.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/52701104958.pdfIn PDF document text
    • http://rurisnet.org/images/file/90092235928.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/bujem.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/libubusufa.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/jijasuni.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/45592963444.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/tixulewat.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/51932206074.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/xomadinotoguvuxite.pdfIn PDF document text
    • http://tano-cable.com/d/files/nubawopejodek.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3203a364e637092c867f3ffd5ff118c3/87881354126.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/luvuwosega.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/juxagozeraza.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210910164430.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/8657706374.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613871140e0a7---jifobatufureja.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/77455182265.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/divetiporowegatopum.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_off0000bf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 16312 bytes
SHA-256: b7bab2e6087c3e19cb68310a94140c782f1697e95457ef4eebf887ca65439055
font_02_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 11468 bytes
SHA-256: 9dd39a84c3eebf666a15b522ba97292f318b94644ecb901c2970f34605896ee7

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