Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df5bb280a1ad67a…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 04:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2af89fc5e8bea4fb3e8454a9471e2caf SHA-1: 858d23e523da2b22114911622cc7516967b830df SHA-256: 0df5bb280a1ad67ad6e06fc245f1cf7dba4bb7e9612e965374f21a870f9b931b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=latest+dragon+city+mod+apk PDF link annotation
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/divupifaloxeriv.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/revurodexovakisev.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/52580657715.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/97065659898.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/tatazanamulobovixuvovozag.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210913125133.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/12321638330.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/9vvefvqq31p2i5t8qd3m37r8re/12995274113.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/4992942574.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/jenagomonivakedejizadidu.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/33157326492.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/2j61g9hga08qsi8rbd4tlvi695/sexapavidiwufefakamudala.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613933396fe88---mekopumozefikakamotuw.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/nasujowegiwivigalebevi.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/wazupevabetituxemidu.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/78563493765.pdfIn PDF document text
    • http://citra.cl/userfiles/file/bubojexejutu.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/6486059721.pdfIn PDF document text
    • http://exosushi.com/uploads/files/33527033328.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/derigazutusumej.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/rajivusoni.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/gixalogupageruzelefag.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/tibipemomasiruxexuwe.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/48911742903.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/46067258276.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/lelijezovivapasibub.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_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 18212 bytes
SHA-256: 2f849fae449d6501958c669f7c6f4554e0b316395c7e8852e0a7b0a17dfde0cc
font_01_sfnt_off000114a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A2 10976 bytes
SHA-256: ed39cd6fd3b99dc0238da2c4e3112859efeb2c5c16fe0d17259cfd7023f23db3
font_02_sfnt_off00012df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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