Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10bf1eb553e96f6…

MALICIOUS

PDF

75.2 KB Created: 2021-09-07 07:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc4f2cb12cb2d73e9281bf1bbfa90616 SHA-1: 103a3c130db3401b4c8eef89239193157ff73109 SHA-256: e10bf1eb553e96f6319621ff8db6f4da883ea645f821e9303072d6efaa00f0d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm pointing to compromised WordPress upload directories. The presence of multiple URLs hosted on potentially compromised sites suggests an attempt to distribute further malicious content or redirect users to phishing pages. No scripts were extracted, but the overall structure indicates a malicious intent to leverage external resources for attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://studiopol.com/userfiles/files/dekotidoxiv.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8aef4398c01fc1af705b674aeaf86762/tifijunubega.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61197d34c6---18389075362.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d30912eb3d---47895167335.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/bb2d1c5ecf4e4202b7fac2b92f15d844/xizadere.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/89958769303.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/foxomiwusovuzetolix.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0f35d07c9b7741f5d0531f0c9cafb1d1/bogilopivoru.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/04dcbdd97354440d6f1aebcba993ed5a/21291947965.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbac1e1eab---86181873575.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/tatubibez.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7730ac2c5---882431866.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e352a2eb4---winusigivivokifenen.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/wukorifumejuwa.pdfIn PDF document text
    • http://nineslash.com/user_file/file/28770013037.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210629220742.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/24852118777.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/rixawiro.pdfIn PDF document text
    • https://maviet.vn/upload/files/razinenuratozipujegijise.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/bobiwiwumibimuj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a81066622f---57042057854.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/pesimaxelegepobowirizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=honda+accord+sport+manual+for+salePDF 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_off0000bec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 10780 bytes
SHA-256: 95a6090d2266600ad719fd58136c065f48da4873511c03cea808af90aae2920c
font_02_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 18156 bytes
SHA-256: 41bedfee13dbae6d127c751b8eeb113860c27871b28152fbca20ad3c8b8aad0e

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