Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fb368ee81bcb9e…

MALICIOUS

PDF

144.3 KB Created: 2021-06-19 07:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bec6b33be416e3b9f720b6fa7d2f6ad1 SHA-1: f1d9ea4d20a594c3d25ecaaf8664f97b96ad864c SHA-256: 18fb368ee81bcb9ecb6c315ce592e163b43995c846e5f989e903168e346d16a5
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript, suggesting it's designed to execute malicious code. The document body and extracted URLs indicate a lure related to 'Tomb of Annihilation maps PDF', with many links pointing to compromised WordPress sites, likely serving as a distribution point for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607af136c7377---vurodakenidewiwitawelofu.pdf In PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc66f1efa8---71753695223.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/88963160087.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e389ecab6e---bufozuwixarefizane.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/81804877444.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098a4c918c2f---11793116582.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f5c4ed88c---nukadav.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee43d4ea33---41070517314.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/fejabavotajalerodufid.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/dubobexemo.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d453537b06---26991383162.pdfIn PDF document text
    • http://zimmerei-possert.at/57301950823.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/df136eb652d4f515ac99f4fcd3d6aeb1/41232077884.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/18021941780.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/juxutigeguwuxu.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/670a49687da6b6b25dc4c8e99da9786e/75742796029.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837e57bb3e2---33033500333.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tomb+of+annihilation+maps+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD22 5272 bytes
SHA-256: 6766e9001db0e1c6f891c24ce08c5a0ccce1c0ec37bde8baf311c92ed9f8d36a
font_01_sfnt_off00020ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20EE6 12836 bytes
SHA-256: 3630235106525524483357c77b31f0311557c701e405064d7aee721a6189e04c

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