Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7d564a69a64b6f…

MALICIOUS

PDF

73.5 KB Created: 2021-09-06 05:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9887ba850fba21f4775530f3d8ee1ab SHA-1: 62fbbde3654ed632767bf317b91197813e1cb2d4 SHA-256: fb7d564a69a64b6fd6f0ab597a0587f4e888244a32c59f0eb8266d017cfa2375
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://weddingdove.tw/uploads/files/202108260528438108.pdf In PDF document text
    • https://otoform.com/upload/ckfinder/files/wexagewiwomonanosewa.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/97026985705.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d6fe38499---69915557179.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/93738083919.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/7008149891.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/xutuzibagoritezoti.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/717760fde3e421ac62fa76164b2f1012/30091816632.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a59fd36c244---dujezelanasefaxe.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16078d43589ee1---541628224.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/75892355102.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/55963460292.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608be617e1c6d---xirujaduxujekafo.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/56611054957.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/naxamefonatajanukumasuxif.pdfIn PDF document text
    • http://e-sheremet.com/img/dopoponerodok.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/felinedis.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/22478354755.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a4cb1731856---kubonelovokisivegetunodaf.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/30145334220.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609eae150a99c---zuwesobibegizikeli.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/89304607454.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/51003615214.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1f42248f055f11ccff3b0fa7134fbb0d/wawitog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=blatt+sedimentary+petrology+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_off0000b9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DA 11008 bytes
SHA-256: 81c45d640d07ca5d89b2a2a07b757caecace57cb9a2aa89102f6043011c9c017
font_01_sfnt_off0000d338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD338 17592 bytes
SHA-256: fe39f77aeebc9ed8124f72cbbe04db51b05de47dcb0a77a0ef64fa634aabfa01
font_02_sfnt_off000100c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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