Malicious PDF — malware analysis report

Static analysis result for SHA-256 817cf73f8395becc…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 06:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bacb93ced32606f9d4c3c7b56278916c SHA-1: a82517d649cc9e58c3c3be1a5ae3f96ec272f1e6 SHA-256: 817cf73f8395beccf252bab930337e11a1bf04d534d9cf41cf59c2a5da0eb1fe
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF link farm rules and the ML detection strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/vivudu.pdf In PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/befaferosomifes.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbd716ca9---nixakuzoradotebetuteda.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/xobogikigugowus.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/422217934a89d6910d6928c44489def1/13425370178.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/kefunetaxi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614169b812d5a---52782414385.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/sugidujanumixasifi.pdfIn PDF document text
    • http://espwireless.net/uploads/file/87302087776.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/33717994726.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/gobatidega.pdfIn PDF document text
    • http://chipgene.com/image/files/20210913_005641.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/11878544209.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/67437319977.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/53397443348.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fp423eiskirb3tgma9c4r9ok21/razemesajokax.pdfIn PDF document text
    • http://melvin.cz/data/79472655253.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/jipovozek.pdfIn PDF document text
    • http://hotechike.com/files/files/tikagutegojezuvisetizonud.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/koxibonikekaroximisibaji.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/411a30b87e6ade759eae15700c5d434c/5689519819.pdfIn PDF document text
    • https://parfumzone.ro/files/file/99413702992.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/motoborovafidipomawu.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/dugejokukilusoge.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/80554260733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=chronic+subjective+dizzinessPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 17168 bytes
SHA-256: 892c3821a967872a31fdf4ea1c961c84c60f1bf75b4351ae04b1bc5340631315
font_01_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12369 10788 bytes
SHA-256: 042981c4db61ea4cc2b2af70b5cca183390f119f54e3d147e11ee18b8ac8fd72

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