Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6853a4caf10cbb4…

MALICIOUS

PDF

105.5 KB Created: 2021-06-28 18:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 579a0c44209d5256e6971080dd3b1017 SHA-1: 5222508e0709702f6ce286269297b1585ae9fe0d SHA-256: d6853a4caf10cbb4eb6dc090b2e44fb6c7ac0e7eed00fd6923e478b8f60bd9cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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
  • 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://laborke.ru/uplcv?utm_term=complex+inheritance+and+human+heredity+worksheet+answers PDF link annotation
    • https://ibeguiristain.com/userfiles/files/gomufasemak.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c8a2e95a216d6df04cc2ecc4f96b0d21/vufizovujexitakex.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e9731d18d---keraratobiwi.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/94796462255.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/92846978238.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e10033605---gesovadifozeweputekapo.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/rufanerev.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/40686790044.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/6370ebc594c8a84133704f34493b327b/39780754793.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/55295828212.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a0560708e---50027288702.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099f93e982d9---74994317880.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5to22bq68eaisb5oqdpq1djn27/61383107408.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2497636517---rewure.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/97586489087.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/zejemogodipunujokilufon.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb63e262db---nolafulakewemazopufobu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160949f2059a10---26830281238.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/95238729978.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/78298629568.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fbe7790a1---sewutun.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1m94875kb1o0pgf5mpc5oh27h1/bubemunikavus.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dd457cbbd---62058161498.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_off00013924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13924 17024 bytes
SHA-256: f38466251e076ee8ed91d01ee300be5e35a66f36dfb599640b2145a167d64c9d
font_01_sfnt_off000165ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165CA 11304 bytes
SHA-256: 6dcf51684c782eb754ec446283d02b03f6839b984fdc6c7b992230f68484dc95
font_02_sfnt_off00018043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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