Malicious PDF — malware analysis report

Static analysis result for SHA-256 98db35cd528ddf10…

MALICIOUS

PDF

74.6 KB Created: 2021-07-09 23:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 28c512ba76da7eda0caeda1ae9e78a90 SHA-1: bea62bb77046999ce252adb306ca44f6d1f452be SHA-256: 98db35cd528ddf105f72085b1db8144cd34080a4a9186c08d1b6652b0d0e1c4f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://universalestetic.com/userfiles/file/5570609739.pdf In PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160775a8de6d34---34250255990.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa9b6c7c8a---tajogopadagifidibumudito.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/diwuvapusawolil.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hg3u1cn45f9u848je901nfqetr/21580456770.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/polawodokonavo.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62aaa998c0---redujobajokip.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/numajorelejawolovugu.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3abfd500f---lilodedubaxepujogixotoga.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd7c87509d---nimupebotipibe.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/2ke0r3ba1p9glifunoegnouvf3/zosog.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/83507731739.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/95965094758.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/25158606757.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a890b3d6657---92617885554.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/begipopobu.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/87880875977.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/26968335179.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210628_E34CE12324B65EAA.pdfIn PDF document text
    • https://asiajitu.com/contents//files/xezuwipudozesexuzorogaj.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/73hedtb0o0um78ch09ackfuk9f/11821568894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=rutherford%27s+gold+foil+experiment+worksheet+answersPDF 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_off0000c0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EC 16020 bytes
SHA-256: 03e328c8b772efbee90f8770135b5578b6707c817b09b0145c49be7849f4870d
font_01_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 11404 bytes
SHA-256: 0fbd320b043b94b651dce5bfac477ec78d49f3ae81eb001da9d9686b3a3eda6c
font_02_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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