Malicious PDF — malware analysis report

Static analysis result for SHA-256 173ce72f3847f439…

MALICIOUS

PDF

85.2 KB Created: 2021-07-01 22:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8ca1397d89ad2f42580b3ed9b45f0dcb SHA-1: a4894ba344d3f1c36bb7372f665a375f51d9436e SHA-256: 173ce72f3847f439d15338fd1e17e49f95ac2505c30f7e69acb6a13832c48afd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing lure. It contains numerous links to external sites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute malicious content or redirect users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of the callback lure heuristic strongly indicates a social engineering attempt to solicit a phone call for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://lavalnerina.it/userfiles/file/nomokuwogariv.pdf In PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/8d1558c2ce2137c9b21bbdf1e0ddf806/54799079452.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a109a0evf6csm0o285b47vlcu/11492760842.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/n2sl4tbvg44o8f64r836v4m28h/zevesigafegenagezekosu.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/8786675706.pdfIn PDF document text
    • https://artbynela.com/uploads/file/fifelekesifipozomodi.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/20257565689.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/ruzujarikufezapubibaji.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/lodow.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0183e19f886b982e3bf46007659d091f/pewuvuwobovobopiduvus.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/b7f5d668608d1ddce6ac5d042e813158/xojofoperejifutaduz.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/580f4f5d52707296ad59907e2bd3d0a1/23079658852.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i191da7il370m7j296ef5tovm5/logorazexefegimuvaka.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6628c13b3fa0f951f0a67b9776e19168/86266396584.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/gejabevifodare.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/l26k0easut32ahguk2o3kfd5df/83503226144.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071f1776d150---ladipiviwidujajij.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e26f2e0ba8---bawiluriwolajex.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/dixejadigejikuvebo.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/d17dlt2os4336dg70uhji7a5t5/zowoxoze.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d181902b128---vutazudugu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/711f7e2a082add27aef574fdd4cb1fbc/81317851609.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/79618057803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=my+75+micronutrientsPDF 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_off0000eae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 10576 bytes
SHA-256: 959c0e48b5e40c07698b3b423b1aa9133a45e5e4f722e0fda9f9b5fbb829772f
font_02_sfnt_off00011b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 17036 bytes
SHA-256: df02b34505c4a389963035854a4f8173f71badbbd8bd653d89f98ad7ad68fae1

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