Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07ea7875916462c…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 02:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bf4320f3dba1078adefeb27c043f9a9f SHA-1: 4caaea4df15a66860ef9d6ffa526b527c0f4f858 SHA-256: a07ea7875916462c4bbad72bf94f1913017fc802af26214e91d843a085e62985
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a lure to phishing or malware download sites. The primary attack pattern involves directing users to external links, likely for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=english+file+intermediate+pdf+descargar PDF link annotation
    • http://files.ibiza-ferien.de/file/zagodakupalasajebud.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8586c719---levumebawonopotasugavokaf.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3db8cba41---rozadalazefupinuxevanuwa.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ace607b9f72---50249548033.pdfIn PDF document text
    • http://sciattella.net/images/file/86149812781.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a19858d97c---60191398314.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/6471bc21327c5784a6f1501e8df9ab34/misodopobokej.pdfIn PDF document text
    • http://fedoro.ru/upload/file/sipikudivuxunuzubemelubo.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/kezesoroxivisadivoveg.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/kiginasewivota.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/10300711092.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/74120803466.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/0f1859adbd5d5e7d2e1a865e9760a484/4138380085.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14ed98a93c---tiwipavesuzinokadim.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/50079159494.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c245f71287a15cdbe84bbc687d2a6ecd/27876437454.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/94dd36185fd1271826e0b69d083a7329/62676398128.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/kue0nbhcheflq6u668p4120iso/98221620508.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/41315207309.pdfIn PDF document text
    • https://olterus.org/contents//files/27040969982.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8d7af82a---mokakumilidiverew.pdfIn PDF document text
    • http://www.thaiticketmajor.com/static/imgUpload/files/nevijinavemoxibizapu.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_off0000bce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE9 10932 bytes
SHA-256: b924cdecdfa2c54c6554e1fe3b30edfd7557bb1a471cb7d648e4553ad62d4f7f
font_01_sfnt_off0000d5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C3 17160 bytes
SHA-256: a70633fa31f5804fe4e29f69a67d513b5181f2a1c08e82ac63b34a504142b062
font_02_sfnt_off00010231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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