Malicious PDF — malware analysis report

Static analysis result for SHA-256 1648af69716e681d…

MALICIOUS

PDF

70.6 KB Created: 2021-09-03 15:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ffb7c5a2b789ede4dc8f8a1964553d9 SHA-1: d326a7b29dae10b878cf88bbf4cecf74ee4d541c SHA-256: 1648af69716e681d87a23ba1c7e408326cc02704d1978299d14f0293623259f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Multiple heuristics identified the PDF as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//26244848791.pdf In PDF document text
    • https://rajatotogroup4.com/contents//files/11053663819.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/wakinadasib.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b88a57d1041---dogakobalubuwujivetukulaf.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/46316770195.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61b1fd6c97---vobezizobazen.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf58b1cbf4a---valixovemekazawupesereji.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/sebenulavowomim.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b056991539f.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884000eec86---terirog.pdfIn PDF document text
    • https://123natura.com/stockages/files/mejufivolizopumuxawaxipa.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/38316110285.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/xelawutinasokurubisegivox.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/60361446940.pdfIn PDF document text
    • http://ha-sine.com/d/files/pasezujepanezezovidobu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bcee73c1322aa6f201a34a4d9f431dd7/67595823374.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b84e0e8cd59---21240192014.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/padetolizakokejonan.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607b912017724---vurakoweloz.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3fc37e43a---53364664436.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/4590454463.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/10746609320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ankleshwar+railway+station+time+table+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_off0000b0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AA 15928 bytes
SHA-256: 28f4d213c66fa40ba5b8c1a2f32e1111b9c3f355bcae1c8ed89ece0fe363ead9
font_01_sfnt_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 11176 bytes
SHA-256: fa893aac6dc4bdd7e68013f9968a6c76bad131062b575c19e382fa0159926d42
font_02_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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