Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b57dac9dc5bed8a…

MALICIOUS

PDF

84.8 KB Created: 2021-08-17 04:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3500408365d9e93ae45c83462279701f SHA-1: 82f676b74814ffeddd86cca72cb2ca2a20c370f2 SHA-256: 1b57dac9dc5bed8a2ca8c5596af3d9ae62837c0d63056cb081d9621016422596
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and an ML classifier, indicating it's a phishing or trojan delivery mechanism. The primary attack pattern involves embedding numerous invisible links that redirect to external URLs, many hosted on compromised CMS platforms, to download a secondary payload. The presence of multiple PDF link farm heuristics and ClamAV detection strongly suggests a malicious intent to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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.
  • 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://infrive.ru/uplcv?utm_term=how+to+download+from+tubitv.com In PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3eaa841858e38e0cc303fd221b59c774/ramojixutabogit.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fb27b1ba1---65431362581.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c4a76c35e74267c9095f86d8d19272a8/1654349030.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075c26519d6e---56373305659.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/1569772621.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc6a346ea---38536249038.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/87329832087.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/89550923020.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/84154060092.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/19904609505.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/66890155415.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1da85516e4d50c968e72fa4d78e9ecac/xuwisop.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b361f4bf87f---22956674864.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/vunur.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/58102095276.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607844e4b32c7---nurotun.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/92f1e03fd2fd14900413ecae22c1bc69/53282462056.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5144a70bd---58011614071.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/42017283423.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3i7vbkn00v0q1k4jpcm9gjvhi7/midavuwa.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0109f7b5f3---bijewufepovanusukopuxosev.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a0d4ce7ca---22355703855.pdfIn 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://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_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 10784 bytes
SHA-256: 865b7e0450dd484f2ec0cfc558ca4c1f7e2f2b554c5eccbdd547f36a0f1e5a8b
font_01_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 17196 bytes
SHA-256: 58e6e45ca9b6c418d57c58c7a2a13ed429a11e987eb182cb6816447af3fd8efe
font_02_sfnt_off00012ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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