Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd40471752b41409…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 11:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5461ebf649bfced0669df4c38fee8451 SHA-1: de88ff4f16b60900822997e4a7f7383032f4faba SHA-256: dd40471752b414091a9b963c3f364ae7e6d72d1694f1e7d6fc075ab02c1b07ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a spearphishing attachment as the likely attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://infrive.ru/uplcv?utm_term=epic+games+apk+download PDF link annotation
    • http://fitviewer.com/files/file/ferawomud.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/94524270462.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/67027150042.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/97455343151.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/62467458086.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/vuxegufubewupi.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47996915029.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/lokotufasugadevik.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/89537848004.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210904205931.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/97984868199.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/dimajaroka.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371dc991ff6---sixezopopural.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/24144503971.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/6727395731.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/kuvijokul.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d504bae3c5---datexuweka.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/54f187b820a36af31cb3121c82d5aeab/lekipimodujizolasilen.pdfIn PDF document text
    • https://festacontinua.it/public/file/14450317044.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/50172047070.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/pjms99vnnepqba0umpac6b9785/fiwisekidefop.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/45997498858.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/62317623236.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe02811b6f---sedidusubiveb.pdfIn PDF document text
    • https://pecintajp.com/contents/files/wawilulis.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/61424082903.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_off0000d683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD683 17776 bytes
SHA-256: b36eaa4f4ccd5b7e83f74e2eaf6a89d7e273011443f6e89992393bd36f1c08af
font_01_sfnt_off00010453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10453 10820 bytes
SHA-256: dc6d251f9e1be9878c637c0b30f91ec6b87ea19d0ad8abfa7e705a117b3203a3
font_02_sfnt_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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