Malicious PDF — malware analysis report

Static analysis result for SHA-256 a141460e03749beb…

MALICIOUS

PDF

75.7 KB Created: 2021-08-17 04:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c9de04a7bed392b4507845aa46e0a17 SHA-1: 3ec3e1f3723101b6c6e818f12603208dff4e7f3e SHA-256: a141460e03749bebcc72dfe7498212f1f17b83541a03ed0f68dbd9f87d9a3b67
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=conduction+worksheet+ks3 PDF link annotation
    • http://renknh.com/ckupload/files/44579461760.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/23867meqhfsbpmkpoqpn0obne7/kikijatinugeror.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adc57497d52---bibupujusexini.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/40477309611.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/jojixovelafisatevodenezu.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/58907716904.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/zavetubexokuwakategino.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/gojobevinoresij.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a8091034a69519185774e20e5bd2c60c/neniwifofarapezokireket.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861de3dba40---87682141357.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/vonezirijikizifexomazepop.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/43235646038.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/50103751341.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/57178917639.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8a7fba1a2---77970698738.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/ropazobalawipawe.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/3kn9d28k1pr2ac8cue30asi5u0/dugixosefeduzufiluga.pdfIn PDF document text
    • http://cichanski.com/Upload/file/28447595788.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/21281639662.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/nanozimi.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/lajilugopujugomagajonas.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e52b92a96---58778648195.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a43f65db2f---xixepenusegefa.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/55334477913.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/18097529539.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_off0000c5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D9 16036 bytes
SHA-256: 801d6dd1e43fbe62582f459e496e34e2ddecc04b9c50bb4ea403313cfc7aad2b
font_01_sfnt_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 10740 bytes
SHA-256: 167645115ecaf32b10e705bbc59766291f81bd3b1e6fce2793b0df81ed95ee5c
font_02_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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