Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf9e08182389ada…

MALICIOUS

PDF

76.3 KB Created: 2021-09-07 02:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73320f3aa493ca53dc134dd4cdffd6bd SHA-1: 41968687c7d1c96ac2cca82ededf6db80ce82bfb SHA-256: cbf9e08182389adacdb351ae9f45a01e5e32ab193e7423ee2d97661d3039af4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 http://tonyprins.nl/images/uploads/file/71190688429.pdf In PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c44cbc8dce---15236748174.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/90388496963.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/zebimowetujava.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/panikisanewa.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607687777b4f7.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/88033132304.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/80584226800.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/kijinona.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/33656845849.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/89094925219.pdfIn PDF document text
    • http://suaups.net/userfiles/file/66550079475.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/dojadutujilap.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2e9e2e6af---fegosajovojivimij.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e85b0517f7e9b58a57e2dd493ea681a8/47272633620.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/52887293718.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/221543235.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/93af9c74e1214ca87d4405011d332ab0/97193106624.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/gunexemuzatakenabij.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/pufoxorevubunulapipizewo.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/4926701503.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/tepiligepekolaki.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b6d0bb6cbef689fd56214955faaf93ce/gesorobun.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/mevixatudekuxenoda.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b9e6abc292d8368e7814a19e3a7fc459/77378119240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=arranging+numbers+worksheet+grade+2PDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/pidefelagikowijisidisad.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_off0000c6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F7 11168 bytes
SHA-256: e6431cc39fe4cc4558a6fe4becb5499702cdf64dcb3f638937b1b6e456524010
font_01_sfnt_off0000e0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D0 16072 bytes
SHA-256: 71b9ae939c570a46e6a06cff679cb29b42ea6085beef015702dfffeceaab0011
font_02_sfnt_off000109d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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