Malicious PDF — malware analysis report

Static analysis result for SHA-256 26682ace4563123e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 08:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7c24225e995145b1bd743810d10ee61 SHA-1: 4752b22e5a6b575259adc435c0b5888d7e0ccb63 SHA-256: 26682ace4563123e4a1d0e14d20075be710cf4a5e9c5be9ffee246d61ea0afb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous external URIs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content. No scripts were extracted, but the presence of multiple compromised links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://oniceh.ru/uplcv?utm_term=pokemon+sapphire+randomizer+rom PDF link annotation
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b7004826e7feb6a5e0f8c5037bb57018/69648005055.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4b3254a22---65138137098.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/musibokavufemubugidugasu.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/guwakuximajagelowiso.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/21510835094.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/fugofonuzuvuzuredarino.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/teleteti.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/dfa88e312c9af0d2cf09a75792ace567/20470128365.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/xixujetajudubemib.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/juwotipegepuposo.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/68900368710.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/49087382931.pdfIn PDF document text
    • http://houselandia.ru/files/vidaxigemedalufemonibuvo.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/vizimofawepititaxewewaju.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/11424194716.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613433f833248---wasumedekifovuvebuzo.pdfIn PDF document text
    • http://techmechengineers.com/uploads/nubonozedonevuxo.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/65309587234.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/13505043515.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139d39471585---jisasafup.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/towizijirokuvigabirijes.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/nitesisukanefulim.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/c800a44aab8f635fde838bfacc9f1564/28624530598.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_off0000da0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0E 10668 bytes
SHA-256: 4e466fa501cfca6e50786b012798a3ee77261317b273c80c6c8e530a215f3171
font_01_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 18276 bytes
SHA-256: e120c25b50318404910fe016d63a90edb28c0708338cbd70d7f17cf358fb2041

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