Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fdefab282d3822…

MALICIOUS

PDF

91.8 KB Created: 2021-06-15 20:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e2a797be6b236ea5e656219d66fd5ab9 SHA-1: fefa37ecf758a8f63fa500be533e87bc503afe79 SHA-256: 97fdefab282d3822d0890591751f2f248d017d2529e319a230efe97b42c3cf2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URI findings and link farm heuristics confirms the sample's purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/uplcv?utm_term=crash+bandicoot+warped+guide PDF link annotation
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/eef0d7c7f40d290517f512d485976705/xibivufosatuzivazuverinu.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/30354361570.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf59baed69---30306095122.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51634be7c9---zapesagi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/510cb027ff2be47f63a8b3668dc518a0/xidusedetusovudi.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/nawaxol.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5be1c777bdd900cdc86e63db916f5598/zolavadixikifinez.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4fd6c1fbb---2536284399.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/30180941866.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160738e9d73add---6011750071.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/051d1a5b22625f833ef32042cfc6dc44/volabadidunonopabi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9ff8faa86bd6280cbb2386cd34259998/mipobu.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/afe8118f89b69b22850121f950033e47/xokesevibe.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/88375709042.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092abd89dde8---1453017258.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cec6a27991---dolazemavasapajad.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd645e38b2---25382157537.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001147f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147F 6116 bytes
SHA-256: e2ac8da5a187b1bd3a1eac5e14043f0657ca85ca44e18b53d86a93b1c7e828f0
font_01_sfnt_off00012984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12984 5440 bytes
SHA-256: c71303a73172cb1e05ce45356415b39692287f1e1eb8418fec8b8a0a8a14aada
font_02_sfnt_off00013c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C04 11288 bytes
SHA-256: d488fdf58d4b043dfeccecf564f94178252b14d1c7ea95c635b2a63e04bebdd7

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