Malicious PDF — malware analysis report

Static analysis result for SHA-256 b158b2b4cb9471bc…

MALICIOUS

PDF

100.0 KB Created: 2021-08-11 07:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: caad63ea766cea1c3557872cc1b17752 SHA-1: 7317408c6b373bb98de3530786e27266df20d945 SHA-256: b158b2b4cb9471bc42ba3e6a9faa73c803cec0b6ba77a57def57f6b615f76925
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 https://philabc.ru/uplcv?utm_term=meet+the+spartans+2008+tamil+dubbed+movie+download+in+isaimini PDF link annotation
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acfd155db2---vodirekafavajevinaga.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/31154875681.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/mikerezawatudozeva.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd63cc7d938---mekijaw.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a23e27b6ed---6169849970.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9938db9eaa4ccd026d8e536f6662bcf7/60819551941.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f591594e02---52659802909.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/xabopopar.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106be6fc10bf---41383758984.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/lomif.pdfIn PDF document text
    • http://temple.mo/userfiles/file/63953088234.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/87273846640.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/fewunavukamun.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/59912570274.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d2754d3503b---pigozibexuzorelumagikuw.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bfcd0d1be---54663416535.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609481bad6255---xagajaraxovuso.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/eb4dd46a052d6ddffd7baa472edf7f1e/nowanositiren.pdfIn PDF document text
    • http://leguido.net/files/rukelawoveliramijimosax.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/a7af8aa2a852183d814dee4073867391/25642435504.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a594b715a53---57288274111.pdfIn PDF document text
    • http://93564497.com/userfiles/81013556939.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/zititajetonedatalos.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/f1d9432918c30ca0910422242627a9f8/judawukizanawudavek.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b133a68d996---17599710346.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/pifozikukapivenogiz.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_off00011a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001323a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323A 19492 bytes
SHA-256: d3c8eb9e451c3a78fde3f9232a3ebfbfb0915cd6d59e2e305d56e836774fc886
font_02_sfnt_off000166c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166C8 11492 bytes
SHA-256: 66f3a993cfd5087a05ae163dcff99cf27fd6aed3679ce67dc4f3b13ce2ec34a5

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