Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cdfd36d7707434…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 03:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0448aa500a3a34e620be06f04eded32 SHA-1: ada6290d6ed298292c7c79210276d59277558b92 SHA-256: 93cdfd36d7707434afd16a4bb732c13146c5582f36874187fbd94165dcbc36cf
196 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 PDF files hosted on compromised websites, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to a tactic of using link farms on disposable or compromised hosting to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b166b8ea9f---dopiva.pdf In PDF document text
    • http://alvitraders.com/files/91252365614.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa077b4540c---13709311661.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3affb1a44---88151123865.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/d17151deaeb7b5cb347cdbdd326c3beb/rifazogowetukidam.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/fajewiduwudidipareb.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b079310aeb3---rapetugifazikewelozagigek.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/8146198139.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e3bc07ae3---9068154377.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/26074688175.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/weterevep.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/99610924698.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/zixawonusemovokimev.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/25024814562.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b90da084---91573531268.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/2f5unbnvc0llbvnijs4i5r1vcf/67534160370.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/55642898369.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/qhflk5jhv3udsrahuthl6qojl7/60947953357.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/89943831049.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/50rsqqvs0dgj1elrpnk7nek7bd/kolonexexafaxerilux.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/zokaxid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=winning+chess+brilliancies+pdf+downloadPDF 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_off0000c4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C3 11020 bytes
SHA-256: 7ffee7d43a64795fe014f3f8e61dc8d33422b0d06e484e931959ddbe90389e9e
font_01_sfnt_off0000dde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE1 19000 bytes
SHA-256: 98cb998f032f63b8445e3fdcdfc7207693bf920a071b894af7a0999fa481476a
font_02_sfnt_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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