Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a040ce775be4ff…

MALICIOUS

PDF

106.3 KB Created: 2021-08-20 05:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3f7f3607d15fb342e3b3f43a49e1f469 SHA-1: 35c59f384d3796a01d4c7719a9e82acdf4c557ec SHA-256: 55a040ce775be4ff406b179c1d7a8a5678b300bf41cb0b63dd220ba20afa9e97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16106cfe2eb7cb---kimogeberizivodikewik.pdf In PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/0ps7ke6k383f45toiakbg7gsu2/forufe.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4acbb696---31890503440.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hrc27k6h90abhto78368b35dk7/35202833796.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/25117165528.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/13255104506.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/57413268613.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c36089420d9edeb11df3f5e2132c97e6/4319913563.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/27220952422.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a8a119b552ed952e9ed1b2b423c3184f/62627381089.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f98b7586---88460330380.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071f39070775---laboji.pdfIn PDF document text
    • https://ibericadearmerias.com/file/mawazejasujazagutonuruwu.pdfIn PDF document text
    • http://gdgom.com/upload/file/210610130412126128aygmvh0mppjp.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8e96b633---xisulefu.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/7gr3hchb3j88hbjhdpdo4f97gl/wujuganezapoluvowuloteve.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/zogulobovipu.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/82673218895.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/4c1da0d9e881fd7e7331186c481eae77/xujalasozejilexon.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b058c8d49bd---54545669398.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/50134726893.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/ac431a0f6a8fd51882e08789fe47c8f6/41331158779.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/be3151569b6687465f212d11df2ec72d/6072757581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=histolog%C3%ADa+b%C3%A1sica+junqueira+y+carneiro+12+ed+pdf+espa%C3%B1olPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001221d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221D 21640 bytes
SHA-256: c90c872110ca63faa42b8c7649821c2e2ecda9538f515784fb2076bad117d199
font_01_sfnt_off000156f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F4 3288 bytes
SHA-256: 192be0c2a4bf2224c6155e2d80662cf630879635262252c6741f9882d915c7d0
font_02_sfnt_off000163ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163CE 12036 bytes
SHA-256: 292dbdfaefa9c827499b2107d585c4a203df4e5f07562bb63392cd791ca0ba3a
font_03_sfnt_off00017f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.