Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd89d0f1b90f52c9…

MALICIOUS

PDF

98.8 KB Created: 2021-09-04 18:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c724b2fc85ff9bc1d71815621dc8a01b SHA-1: 8b25c0f3766b3cf4a63b5b3551490b5449a23405 SHA-256: cd89d0f1b90f52c94383ee467aea85dacb64f65c9deea098d659d28962214fa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many of which point to websites hosted on compromised CMS upload storage. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a227514d6---78887273240.pdf In PDF document text
    • https://ls-machinery.com/uploadpic/files/202108152105477527.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/zejopefafi.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210813050424.pdfIn PDF document text
    • http://accronline.com/userfiles/file/mizowobonasozibagu.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/749c689afa35d0828c4dd5cc4afa4215/5175547819.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d50feaee8---41911091868.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/a50b77cf19114f207c064db5c7b5c16d/lutifedofewizebuk.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/ropolekaxujuxux.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/sugorowasafuzofa.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ur1renuhm0s1qpecboq6f87h67/fekovisixonazadago.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/14888237137.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/421df454c9b1ae13eeb96815e138c320/nesobugekulemugadag.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0bf11c900---fadorokapowetixiv.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/216967533.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce14320c906---nixegepaditadizinowaguf.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/fanubumivowovoxitij.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/efbdb78791ac77b1b7919a6be4a9ec9f/salokamikesuwivare.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/77500090555.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/nesawarizudegob.pdfIn PDF document text
    • http://vinmexindia.com/uploads/37245442915.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/23aeb53a8d99b76076813961cc565ddf/18346639945.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/zufajofusilusabokus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=siringomielia+adalah+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_off0001188d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 20364 bytes
SHA-256: ec1d0d7779b5faad861c9e1ad55488a44df384611accdf415021b732a8541f9e
font_01_sfnt_off00014d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000165a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165A3 10756 bytes
SHA-256: 7d69aa1ede105a8ee5e6f6665768a366369042e731a9ff466798b54e63cbd22f

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