Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea86ce796d301db…

MALICIOUS

PDF

80.3 KB Created: 2021-08-06 20:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7734bf6dbeb9016639403a91a4114a2c SHA-1: 83cbe2267a7de61f63d9aa9068bc0a02ad11a114 SHA-256: 6ea86ce796d301dbaf0c014e71e00dd0dd30da11b6140081d9a926da6dbd4148
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0e8d4ff9---pipivajef.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e714c40d184---78842512946.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2caf34be08---6902089327.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/fiweta.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/58028241475.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/besesejupokopatarum.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aba15fab456---rolisajupafelitoriv.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160beb7da99cf1---88056986690.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/kuvomiwifozezafufotizuj.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/65259817450.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/4836daa6dc0237097468ed987a44fb0c/56793046639.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/vi1sqsotvl7ocvslml41rikqc8/46008673486.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae2ac8bc44---83351947191.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/9fo2l3dm9ls8vu2uu2dm3abclc/74292190294.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jidbe3c2gq1ffc56c2jc3rb968/24259658118.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160833830dd231---66146605923.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e8fe63a19---sijukiwobol.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/vemigefosemawuzor.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/35353923359.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/260f3b712aa990d81a19c0bf65932ad9/zosasudinisofogavemi.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/719169e336d5309922be9f2c6fc71c68/88716830581.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/14029074506.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/sipadog.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40daca1854---jusizaw.pdfIn PDF document text
    • https://aneri12.eu/res/file/lugomaturu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dometic+rm4601+3+way+fridge+manualPDF 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_off0000d44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 16528 bytes
SHA-256: b9150dadec579745906d26a7345da1c1a344aa22436fbefa337cd963e0bf9364
font_02_sfnt_off0001172c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172C 11544 bytes
SHA-256: a6a931e84970537dd300a887590afeb050e8a39de75477e0f68e935a7d9767a1