Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e16958ed9b72aa…

MALICIOUS

PDF

94.6 KB Created: 2021-07-14 01:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4fd79780204d88e0373ce54962e65277 SHA-1: 674af84f26f815c6374e66648fabac08c2d5cb49 SHA-256: 16e16958ed9b72aa7a4e0180bf609fc1bffe374af12dc3abee4bbd712382919d
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 0.9936

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 https://crysiq.ru/uplcv?utm_term=how+to+block+notifications+on+chrome+android PDF link annotation
    • http://www.bufolari.com/public/immagini/file/84521455430.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/a7bq8j6u4ac7a2o3c08mi1a0vu/nugemeri.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160835eb87b071---bipulep.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464e0d2a5a---23890696781.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/4566989053.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed474ce459---fazukedakipa.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/fuzugurot.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/bujap.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/9aef4e9f03ff9c0f9e847d7be9248038/gilowowiwapetuxiv.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/bomijesibatomob.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/88261989279.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/52268435855.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/nizeveze.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/554a345cb5831f7c0cd7df52866aeec3/81989740568.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5fc5a150d76069cfc18aa4cb9ab59c3/rapumizabovifuviliboze.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a01b04c5d0cdabf6b0ad5ea52ed46944/dukabebuni.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/43982517537.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zufir.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5f906a9e46262eb6d322b76ca73a15a0/tasagedilu.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071226f598e2---74971233108.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/49415581192.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/phdfrtfgian8itkvatgrqoiq73/bigonenoxonezegatevirole.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 11052 bytes
SHA-256: 3b3a0d002569dcbac0f026ac790e116e4ce1ff8c16919117906bf50138f4ab91
font_01_sfnt_off000111e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E3 16804 bytes
SHA-256: 9127f1ff353c4ebf67da32f1a95d890c73ea4cfc78a67414cac3f97787d2703d
font_02_sfnt_off00013da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA9 16460 bytes
SHA-256: 95e4814de848d96e3aa5a62878de2d5ab0284984a078690a2c8246c6ac3eb758
font_03_sfnt_off0001544f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1544F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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