Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3dcb46c7d35d7f6…

MALICIOUS

PDF

76.6 KB Created: 2021-08-08 20:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2dc6ce0135599096c1c121baf9018a2 SHA-1: 54a63298cefa4d54e611977aae97a1181fc0039b SHA-256: b3dcb46c7d35d7f6f4970ff206f2fce3c8fe67dfd624a0aaf2d0572ffb1e4dbe
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, with many distinct hosts and UTM parameters suggesting a phishing or malware distribution campaign. The embedded URLs, while some are marked benign, are part of a larger pattern of suspicious link aggregation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cesiedizioni.com/userfiles/file/sanejejaj.pdf In PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609425551f396---34633108314.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/83afca525ff01ad86f05ebb114f62746/tidugimovovujobu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dad2a92d92---20766881014.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/28856476390.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/zujazezudit.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/vimejiluxototi.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/xemutojerexofin.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a25701088a8---xubememenisakuropefem.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ti3pgaptn5budtnba6jkitvvt5/duduxezaw.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/94589984298.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5698742603---86613728088.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/09df179c7c64d851bf476a595b4399e1/fanujegupirozibixo.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/34759746629.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210808_190203.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/nimawekesibibowijijog.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6febc8f2f---51044347237.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/58387738453.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/21720403001.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/62647027497.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2aded9963df069b10002414c096a905b/33782789545.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/17535996987.pdfIn PDF document text
    • https://rjpexport.com/files/22357228604.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a7512f698---46900077130.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/menenipoxodijetivewoxotav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dominion+energy+utahPDF 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_off0000c7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 16628 bytes
SHA-256: 8302f8d1fd5f79b69726ca9385df32fac9ad3ef52069c3d022e357fb642d1a25
font_02_sfnt_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 10556 bytes
SHA-256: 27733fae9daf5def363d4fcc369b49b53dec8a9ff7c0a6d03aae3afba2e12dff

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