Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f997dfd5f608af6…

MALICIOUS

PDF

88.8 KB Created: 2021-06-29 00:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3876528093679c0d445057355f8647ed SHA-1: ba747b2c0cabbafb6d9b45adb31598f74a20a3de SHA-256: 5f997dfd5f608af6c02ed9cabc135aa17a2a5c6d2e216c0a925dfe7208003278
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • 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.
  • 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://cherryontop.pl/upload/fotki/file/29137071940.pdf In PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/4cecbbc633b373a6f65b8756c0a5fb7f/gedinarojovedegak.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/cfe948130c4291ea046f48e4875eed53/11379950939.pdfIn PDF document text
    • http://climtech.com/files/files/43782271240.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///tinebafi.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/13114596770.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/50355228660.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f568e19d2---lezodid.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210608000954111.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab137fe85---vidomukug.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/781bffcde6a56acf5f31700eace0f43d/80184149734.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b604176aef6a4152565cb747950c5cd4/voxutigoxamotagebeb.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/jakosekorefipenowukijek.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/iaslv6pqk249u7dkp4l0revsd4/zakobumaga.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/afd9ac09a608b9d03d183f47a5e9aada/17159272625.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c42e36c2e367ebe1860b20031e4dc738/88152781363.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/sgi37e538hs4jsjqeunk7h5ne8/63775209099.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/95670346892.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/44103222946.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717d9733ff2---wuzog.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/gugodivisarefesovamuko.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ito0l69qn3cbsgabfpbmamrvp7/xisajiwe.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/dde9aefd7f3d5e37ca0b8030ef75beb1/35328406929.pdfIn PDF document text
    • http://tfforming.ru/d/files/2341135920.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/52366240366.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/18449a3c8c8fe44d6a8fb7fb6d424b89/bobekomowagolumexato.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/kajowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+mystery+of+the+parsee+lawyer+by+shrabani+basuPDF 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_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 17812 bytes
SHA-256: de4f143b6e44fe0a645c3a872026e544c0e1785e84975991708508d20ef14adc
font_01_sfnt_off000123d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D0 11028 bytes
SHA-256: 3e93dcbdd4384fb12d3cdcb92f7946301b0370386b4fd36bd1ae68d7af795a03
font_02_sfnt_off00013d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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