Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d9f4187b5e3193…

MALICIOUS

PDF

133.5 KB Created: 2021-08-18 12:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dadd475e6edbafdfc0ba6373624a5efc SHA-1: 2fe28221e1ff642c9be8737cb06239f04a2f6653 SHA-256: a5d9f4187b5e319345856669f6d6bdeced8aa46a6a6a619394a1034c5b758c05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The primary URL, 'https://allytemp.ru/uplcv?utm_term=essentials+of+international+relations+8th+edition+pdf+free+download', appears to be a redirector for a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=essentials+of+international+relations+8th+edition+pdf+free+download PDF link annotation
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769b76bb221---53499184253.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/33354554133.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/01c6f7d309881e54ff56f22aaed5b221/rafato.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/89655159289.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/jodefi.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/burupezulol.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/sixiwipikumalene.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2fe11ca751a218fce4b196776a05a289/46899732939.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/9a588fdb3afd5ef620ce3f7ca9f0558f/wujomaful.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/5843432138.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/52219636712.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/sagoxomaw.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/rafelapevolagawedudoku.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/51091026049.pdfIn PDF document text
    • https://sce.tw/uploads/files/60c379d923bc1.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/65211792841.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b83aeb3bdc0ca34b5c31fb4ebe17ec73/21084535390.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/kigavoliwubefizu.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210808_D044011E8676333D.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad50b42df18---84454824924.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/75449484256.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/fukinesadamarorez.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/55086419927.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/62111843204.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16073bfd92cb48---45831563497.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/56580564419.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/p9ugdjuvmo2ogf12mlpiphc8k5/37333151040.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E26 1660 bytes
SHA-256: bfe43d5959b2317135891740ee9f6bbd83044a2dfc391827d4c50438b6b55e15
font_01_sfnt_off0001a60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A60F 18392 bytes
SHA-256: 98e07e74d67aae331dd29b2e61e01ba942b1ea31eea8f3e0b1f70b37cf47bc2c
font_02_sfnt_off0001d538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D538 10872 bytes
SHA-256: 4fd2846130cc5fd846c7aac4c905968a6fd46aa64a7ca3bbed6cb9a0add1731a
font_03_sfnt_off0001ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1