Malicious PDF — malware analysis report

Static analysis result for SHA-256 f906bbbebd1746fd…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 20:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9b960efeeab3d3feba0e83332c9585ec SHA-1: 53e765c6020606997a5afefec8cbe1cf8899b65c SHA-256: f906bbbebd1746fdff0e37d72978a254772519fb0ed95536440a540f46b119b2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm designed to redirect users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://aimic.com/userfiles/file/jidagew.pdf In PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/28746376266.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/kitelomisigexibegituxazeb.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guzujetibememumu.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/qgn2urplmaoseitn9kamdg1dta/38173659791.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/rugiluwufevul.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/58634839944.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/tegimuxejixodele.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/kamutuxuwulokid.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/72510961581.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/31599644431.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/37434676870.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a03451af573---5009292431.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b5d23d87f---wawoje.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a2184e4487c---32162974081.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/punidezilanu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb91c7147---duvikufag.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/fc11e015aa4a44e43d4e62f69840b48b/xabefunepafuja.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/35576813885.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3c0afb24ca5101c5f14ed0fd606c1e9b/42464671938.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/kosojasudaxobireget.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd7c4d61b6---18550708420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=state+and+explain+newton%27s+three+laws+of+motionPDF 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_off0000d61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 18452 bytes
SHA-256: 35af810ab7a839bf5390d6e662bcf70134feafa2f3987a815ebdab34eaee8254
font_01_sfnt_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 11060 bytes
SHA-256: f39fef95b21982e12909d39399ec6eaffb786ec6ded82442867de5b8c0389fce

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