Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd498a73ce27b255…

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 13:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3f185f38be8f79f1df05181afc5d7d69 SHA-1: 1009baa611105d4877378381e6fc26ce36bdd22b SHA-256: fd498a73ce27b255185513d3b91b2f93171c4ebf355e58c0b22166f6ee637d0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users through a malicious attachment to these link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa211b69db6---55645706325.pdf In PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/58784746154.pdfIn PDF document text
    • http://jejuecotech.com/ckupload/files/pumomazaxaponol.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210618043616367.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/rexikubemaz.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/riwokep.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/fosijit.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/lexisaguzotaf.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a60a9dfe58---nizopusexufuzibejupak.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/muxotulewagowebex.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b7149fe97---75776568790.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/najijonopavifejemesotuv.pdfIn PDF document text
    • http://glttek.com/userfiles/file/zixeruvagadiranu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/446e7d77113a809684918ea1a215172d/3554280073.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210510030736_2092501007.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/betowaxozirire.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31f8a37a88---12290904204.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/5650238794.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/26067043656.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/bi0no3t0l6kn1nl2b34e89i9ot/69204065220.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f08e9192ac0b59ee482921f9b076ba61/xememi.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/28159371259906c038331d6be18f5739/21368367172.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210811_DAD1CA4A3470173E.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/wiximirad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=comparative+exercises+pdf+6+primariaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 11000 bytes
SHA-256: 59a4bfbc8d57382612fb116fe58af4cea22b34946eb6d80077261bcb22192878
font_02_sfnt_off00010de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE1 1804 bytes
SHA-256: 40ce09ec31e5c9a3fb5e0f5b15172400635f0acd87b1afeadc5119a6a0df2b9c
font_03_sfnt_off0001165a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165A 18340 bytes
SHA-256: 20bbea4b41692c5205faff23ecdbcba1abd84262b2a37f5388bee6f16b47a49e

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