Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3dbdf00438af40b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 20:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff6a2bd0b4c996334ddac21d62046739 SHA-1: 08eb6d301c4660684e8c48b3aa50082429f8aaec SHA-256: b3dbdf00438af40b552dd6190b5c7f8d1c268ef2bee6308e1d66acd80ffd1556
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://justforjetscatering.com/userfiles/image/files/tijufikefakigotorevoxeja.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b30009c3e4---gozisoraw.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/36762174598.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/zoxipenixivodulox.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/77639698750.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/wulox.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/pumudipes.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a594661600d---69899110756.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607445cce66ea---76546794892.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/goin0ng31jge80vjkmp2khgieh/fatavaxifisotenebameja.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/61146803896.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/jeweziji.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/34037580320.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210702082807.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611c0a98103a2---70881093089.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/12e180353a4496a1287635afa31b6f12/vakoporez.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/ed975a31c5a541fb879cce21a0694ca8/jaxatoma.pdfIn PDF document text
    • https://kueapem.com/contents/files/zutozolagutewilifuvutef.pdfIn PDF document text
    • http://ahhsclassof1980reunion.com/clients/e/eb/eb0bda5e83c72ae03ef0bdd1ae4752ba/File/vuxaposaxiloxivi.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/95870049783.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/8983249326.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f35e70fb9---97893814028.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc9a6b8fc8---59753328083.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/89697455829.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nebexugato.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/50833729824.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/26820983182.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/63034683972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cpm+and+pert+nptel+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 10308 bytes
SHA-256: b46e98a21e6204357a2c969a437bf692c9d3676c3698bb82701c686760722065
font_02_sfnt_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 17428 bytes
SHA-256: fc0efaf4497abae1161a30ee76e0124365c0118dd9c4a7705c3a438ffa264fc6