Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28c4a5c8f87286b…

MALICIOUS

PDF

88.3 KB Created: 2021-07-26 10:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4479766f74eda58d0829cd4fb4f2321b SHA-1: fff3e90b95c75a7111454859d0603517cef5ba4c SHA-256: b28c4a5c8f87286bbc8a33654efe29b139d4f997dbd9626fc58f1489565083d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload directories. These links likely serve as a lure to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b28a8ca77f---29486094699.pdf In PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/950f53331f95cae3f95908cab319b5a8/755027477.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb40e2a4ba6---57421176219.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/gn1635f7hccm4qsrh4lehae85i/medofoledebajafipu.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098c051d7d39---28441573025.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/waxapudebovafowu.pdfIn PDF document text
    • https://hagepoorter.be/files/files/74822441346.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/28840147715.pdfIn PDF document text
    • https://kartplast.com/resimler/files/wazalititojozezug.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1097ecf132033eccbade8880d0715c02/59535710270.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/6918634242.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/sitikodivozamidodufajuxaw.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c0b37da50---21651547699.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/89631231619.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0c1ee236---5510680950.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/gatolapobomixowamipafu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/juslh3d9b3uoebloe850qmlgvk/marezabimirudaxebegoz.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abef9523ddb---482777321.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/12082625509.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/30050360355.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070720e2ed4e---10431750755.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1dgth42lp2tg62gj9gsqci1u17/19223206038.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/sowadanuna.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/6jf4i8jr4i3ldtah1g64marudr/retej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=brown+bear+brown+bear+what+do+you+see+writing+activitiesPDF 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_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 11164 bytes
SHA-256: 8174ea551c2a6e3e07a51a59bcc3448a96b341996a9b83ba3e620ba980884615
font_01_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 16940 bytes
SHA-256: 39c8fe3d08b238036fc7ceb85f8dfbdbb050ea82e60ef1990e18f30e3bf8be3d
font_02_sfnt_off0001396c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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