Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fc2b36d3557865…

MALICIOUS

PDF

74.1 KB Created: 2021-09-08 00:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f878cbe10adc5d27f3339a09002d14a8 SHA-1: ee42b6c1e9af7f9a9f1e757e826ca1fb2bc77a53 SHA-256: a4fc2b36d3557865cdeeb42e1af1e0bf058117c95ad80c60bd3c773def81fe43
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose is likely to lure users to malicious websites for phishing or to download further malware. No scripts were extracted, and the document body was unreadable.

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 https://huntic.ru/uplcv?utm_term=cessna+caravan+training+manual PDF link annotation
    • http://sdds.be/userfiles/file/74255335250.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/tinofojo.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/45650840798.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2a3f6e2be5a83e9364b6c86b2a521e15/lesozemifofotub.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fbfd3cd54---41323891141.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/93tkpdthn2jratjhm09lcsmho7/patoxevuma.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/38405241493.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/48049345943.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1320194345---54502949542.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/50652934607.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d943448d39d69d3657850b9d485653f6/zufinimefunadoxuxer.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/tavegerewazi.pdfIn PDF document text
    • https://fishuntpesca.it/file/vebenejepodir.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b0932158527a45abf69a4ebd082a51e6/daxumirakujowaginezipa.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610036824167d---13995726205.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/3736885293.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/sozekavelowiwuxaxizubetom.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/sirukote.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/dujagonuragejimibugis.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40726428647.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/1feeb0117ed47ab751340d0aecb7a305/putomununosowepa.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/fubotisewotazez.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_off0000bd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4F 10652 bytes
SHA-256: 22812437bede7fd85ff3f54be33c001690885b30abba724c7878bb4192b7d456
font_01_sfnt_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 17532 bytes
SHA-256: 5c669fb2789ac5d0e9fac30cea37fcda8698b7f7fa1412a6f405ccb4a901ee4e
font_02_sfnt_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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