Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f9b70c5f9ec8b5…

MALICIOUS

PDF

89.5 KB Created: 2021-07-05 03:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 724539af8703ab3841bfcfce954b88ad SHA-1: 1e864c070acab49f44a1f7d5120e0ecb11cd92e4 SHA-256: f8f9b70c5f9ec8b5abc65635aed74853658f2ae410b05bce7c2466075f4ab200
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs, many pointing to compromised CMS uploads, suggesting a phishing or SEO manipulation scheme. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to distribute traffic and potentially mask malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://akcjonariusz.com/UserFiles/file/guzikipolefu.pdf In PDF document text
    • https://aprilboya.com/userfiles/file/gaxodusifutopukav.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0727cb8f9---beluvomupal.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/bopobilat.pdfIn PDF document text
    • http://nktrading.qa/file/files/bisugatosi.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/mgfk8qend2uh83307t1f6ludha/xibobagevumutoga.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/fce35ef84f55f311c0a9c80922c70533/28501158560.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b317dfec3fb---50185688277.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaa0b04d92---38869944782.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f79b44457---31975669141.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/palujosalixiduvemevide.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/44135010759.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/bekulire.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b32d3683709---gibikudanuda.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/tejegopove.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/95979291193.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd9398be6---nuradapeposadip.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81f84c95a7---4701447336.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/21768732241.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210618223248247588.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/rgu2f752h3j77439i53ds6d2p6/62368593884.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/guzopinemulo.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/314c9fa7cdfb2a0a206ea8c018a0d2f5/25775619068.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b500e589d---29905023855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=inside+tricep+workoutPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 10528 bytes
SHA-256: b7d2f2ae3c1436f856610809cb1ad2aed98bb0bacb4d03ca3eb315f5a8d8e9e8
font_01_sfnt_off0001139b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139B 17288 bytes
SHA-256: 4fc63b611ffd057437d928b833cdd80a30f88e4db34182875f18e32bbfd371bc
font_02_sfnt_off000140fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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