Malicious PDF — malware analysis report

Static analysis result for SHA-256 211517bef601cd52…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 19:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b90966eeffb41b78140569d5942343a SHA-1: 71aca602dc0398355fbed51c7dae5f885f30cbfd SHA-256: 211517bef601cd52b57870a3cc367e01dc9de97bac7843e227acef7c77e1008d
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous URLs, many hosted on WordPress upload directories, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b731973c125---35508999351.pdf In PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/48695263660.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/2adp51qkc759go9c7t2r51tgm1/dukajizowixet.pdfIn PDF document text
    • https://aspirans.com/files/file/wexalumo.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/bagopilu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/f462cca7a5a8888042e7cdc0517fb6ae/39821662962.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd4820e239---63403173723.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724aece173c---17552784273.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/5613700632.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/uoir3r48ja0n32g85oig1oertb/3815390831.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/52476988434.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/famusetijulo.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e0d711ffa1df2789e6ed341c7d118238/17636410932.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/83e75706589b2fa806c0e649824fb379/31263565468.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/16132685716.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d12fce2433---51944916836.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/43463877739.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/1c84392bde2e87843e634b1d71eec0e0/rofosatinepilagexax.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/61549074482.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/75208344914.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/sumuferobogobopafemipi.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/falizaposoluxofipazebidis.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8963adb4d9506ba8f4828ecaf7c19e8f/mogolufuw.pdfIn PDF document text
    • http://regcureguide.com/files/files/85048194737.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124ed3c023fb---gunaxuwidibetem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=owasp+prevention+cheat+sheet+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_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 17724 bytes
SHA-256: ef893054fe4b05a4cd15da0fd81f7d9dd4840043e04e8ebb56f4e0a5c4e05c8b
font_01_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 10848 bytes
SHA-256: fc778aa087e77ce72b0a974e7aeb0cb996d8bbd4c2fe2bc737c958c7fa78ed65
font_02_sfnt_off00013493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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