Malicious PDF — malware analysis report

Static analysis result for SHA-256 948936eb183cdda2…

MALICIOUS

PDF

88.2 KB Created: 2021-07-21 14:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1b37a274d87a5b80c803e3191503f73f SHA-1: 701d1a93e1f3d999b7f9c9e60a6c2d55655a04af SHA-256: 948936eb183cdda2ad52e1e4195a62d2157a5efc4b1934ab836983a91ee51531
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL patterns are consistent with a link farm designed to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607734e35bf72---midetuseribixekazezu.pdf In PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4cc11bfdb---40172907355.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609643229efd3---64003825276.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/382691753966c59739b6c244bb221a12/zutegovupotufoxatipifi.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2de71a3f372a8fc577dff485de88f68f/jejuzumojej.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/bivafipukavovutetogame.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/5382964df5fce518dea5080a7d456564/xusugomawuwobojizivewafe.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc20f17ae---64574214515.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/58984283343.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982f1eb6cb8---bobatunurubozepewito.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/22980674472.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/77451639111.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160903d8a79350---45721794023.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7373b7763---32010111386.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/jogizijefuzol.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f4960cafd61595b6671c22516e67e767/17011527245.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/6d77bd16e42cf0aa7ff8d9f19926672e/metuburunofewizekukixo.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/fidow.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b5397f6e2---94247248960.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/sisuvezasi.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/11825391961.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160762d2814fc4---kadepaluwebadafujavevoka.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec43e5f54---pajojow.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfd635c7d1---luvaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=unleashing+the+powerPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/149f09aa215a4c30fdbfa4076e41460c/tiwumunanigaberetoju.pdfIn PDF document text
    • 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_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 10624 bytes
SHA-256: 14d3baa6d1aefc789c86671be5f6667f755a5e072bb779867e5f954030bc847a
font_01_sfnt_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 18208 bytes
SHA-256: 0deb1dceeb37e2918d9e35768440befe3e14ea266a4b54dec6200fff3d88f5d8
font_02_sfnt_off00013a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1