Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6cc9894c24db55…

MALICIOUS

PDF

95.0 KB Created: 2021-09-04 08:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb524a4ee631c28bb72c59deb6828d55 SHA-1: cd29423842a2f22f9380e4e1376cea4ad883e4b3 SHA-256: 8b6cc9894c24db5558e0837dc9a0c622e65edde3b04c54500d6b0a4dbbbbfdeb
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is unreadable binary data, suggesting it is not intended for direct user consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://mebell-city.ru/ckfinder/userfiles/files/firugekajavowojegupafi.pdf In PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/inb79ftb4mqc3981837j38h081/766800680.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a5cc3eb349beb3ad95a92168d59fd38c/36217280745.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/61592133552.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/tl7m1a7s8asq10a28rqrg9gde7/ruparab.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/rizabijogux.pdfIn PDF document text
    • http://mr-alian.com/upload/ckfinder/files/89325485994.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/sasobudegewutaf.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/fatisumov.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/32be8de11c432890d5bed2a587e89dcb/jabagedabuwofibo.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/61942269649.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da10195770a---6554390999.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ab98ac2d3---fezanuvujawo.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/lpo9ji9ad73nnual36c0hc8p47/25549329818.pdfIn PDF document text
    • https://digireg.li/upload/lalazedodaratezukatewiwum.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/40044342398.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jvko4i66ggphu9q2f2kem0tg32/supebejolikunajimog.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adfdb382ef---96907183768.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/57728370437.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/botikezekoxoxagavip.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/65781795407.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/webaxepojurabe.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/l41jct8afna9qpmarecogl32ks/maredafowuduz.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161149b6e3f70c---mobaxotivasebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=elizabeth+bennet+character+analysis+essay+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 10892 bytes
SHA-256: 0635814b94bf3fe4dc2e04560369bcf417c1abe9038513895d5546e6e2dbb3cc
font_01_sfnt_off00010bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12408 17840 bytes
SHA-256: 5512b000cfcbf8c17a046c60278f7d35ebf72fe6cd7d42b5249b16a8166e4f8d
font_03_sfnt_off0001524b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1524B 17828 bytes
SHA-256: 68bb3817911fbb5967b8ba629b701df22358bef3596f8fc6a7e3a85f2ae9d2f5

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