Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31905a0f30db291…

MALICIOUS

PDF

93.5 KB Created: 2021-07-02 08:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 958d29c86920f2e1fb8964c9d4e07385 SHA-1: 4ee6ee850fb4df60d521945508faeddcb627fa48 SHA-256: e31905a0f30db2915466e867adb0d6836c41bceeedbdbb7cc4cdb875f5f51ba9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zanomaterawolokadilin.pdf In PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/33498204080.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b580c371a3043489b66d45e5e009b3af/venodezigat.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b27c8fc749bb5f8f17b4775bb2e591c4/27813217149.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/fdcb05395664b636450ab708bbab7683/nizemakamufukavomivizo.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/60600648149.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/zegotanodotusutatu.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/sowejarebagup.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/33181048524.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/65854157747.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/dujopijovovapudebusutazed.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/5237da39c66f613e2117e2fa9968f7c7/budutogoposufurete.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a74fc318eb---japipodof.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ef4425b21ec906d51b97486ce31a632d/21272755575.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abc4980c262---tisabodaxigajix.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/49922156517.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/ribox.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/51597265677.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/xowuj.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/72758120354.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/40099740182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=path+of+exile+all+charactersPDF 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_off00010c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001248a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248A 17064 bytes
SHA-256: f6eca5e7c9e95bef00ae028e65331b1f1eb77ea0d6d17b8054322ac0f35ea389
font_02_sfnt_off0001510a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1510A 10432 bytes
SHA-256: 9bc5427adc1afa84c35d916df21b0601619c5c110d8eeb24a313370e452b21a2

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