Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d03c46c036b3a4…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 00:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fbad7e867199331c68a906b1cc8f958c SHA-1: db437b4c5a2b7961f33a82ca435772f361454a7f SHA-256: 35d03c46c036b3a4489e6080c6e58aa2677f67b912afe210107ef0c5943ff999
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and presents a visual download button, indicating an attempt to trick the user into executing a malicious payload. The presence of numerous external links, many pointing to compromised or disposable domains, further supports a phishing or malware distribution scheme. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://balletpanov.com/uploads/files/pilexudomapano.pdf In PDF document text
    • https://muzeumkonstancina.pl/attachments/file/2810895862.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/gopaxasufijabej.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/5ee42f1300859118772b5dea46953fc6/bikuwagiridizototaw.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/dumosi.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/74215784650.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614501e9d4bac---2868246572.pdfIn PDF document text
    • https://webrobogo.hu/kepek/pewetexew.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/24334322048.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/49425233484.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/fusurixavikobagopukapib.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343d17093d7---rapozugixuxusuvemazinibu.pdfIn PDF document text
    • https://kopari.hu/files/file/32442269305.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/demadimojetiduzosesekubaz.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/rosovuw.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210902122521_pwhvbe.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/581495836.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/85457469566.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53660af9b---66259577471.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/garuvemirutosuj.pdfIn PDF document text
    • http://kd-council.com/upfile/files/fexemesigojexupidixubeluk.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/54679649643.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/jebulebisiwozu.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/71549156860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=joe+morello+master+studies+2+pdfPDF 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_off0000d2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 16652 bytes
SHA-256: 5597e57fc7aefd8bc5f0e90cec1b7ae16f71ac2c681d2b24b21139bde550a7c2
font_02_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 10764 bytes
SHA-256: 23952be011a4c73b3bbb9ad179c728175e06f462171bbb34efc574babe5dcb38

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