Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a165b014edc2cee…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 12:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 779244114c76fcd0d585e8edf00dd07d SHA-1: d86a21e69e93e9773b0548cca00fa811a1d54217 SHA-256: 9a165b014edc2cee77171b6416a8f8b9776c08ce1fdabf52615b10f62550ead9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/uplcv?utm_term=give+names+for+the+following+substituted+alkanes PDF link annotation
    • http://kirakuramenandsushi.com/uploads/files/78219913516.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160730792d9b28---bepilatubikikiturazo.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a5fdfb27ae134869b8358e02959f7b1f/dukodawuk.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/66331939809.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/01e7f1e4e21fb331ec01741179ad7516/55680040752.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/3477b68d5ecc3f44def982b8a4537ec1/pafimidalarekelenoxe.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/9066017451.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/86457182223.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/26767767421.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/famibub.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/12391933943.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b842ad41eb1---munulejamubevus.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/cb9435ef5db62614d041b31ffc2d7d86/womosu.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/kikomoxisegujoletaka.pdfIn PDF document text
    • https://naoshima-habitant.com/58844271471.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/93649945975.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/nopunadasidexer.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/naxamiruxe.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/cae4832342d89a7e3defd9f6a08b4daa/gawuwazeravenoduku.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/96977111605.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef217becfa---nesanapotago.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_off0000cdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD1 17196 bytes
SHA-256: c8ce378bab05d01d64ccf07e0fbaee729586d6ad4970bf0e57f2660c4f9b2e46
font_01_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 11324 bytes
SHA-256: 4e6286e1dccd0c066a59d4a2fa9a84e8847e3be1d77da1617ea520b32cbe3627
font_02_sfnt_off000114c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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