Malicious PDF — malware analysis report

Static analysis result for SHA-256 05666e1358621886…

MALICIOUS

PDF

92.9 KB Created: 2021-07-02 05:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc66f3c3ee0737a196d56fb2b079563c SHA-1: 3dd7a36e24a888fd7513ec13928e9b61e8228a21 SHA-256: 05666e135862188680c7a162559e3a0b82cc7343ebd7895282edf15e5b378c03
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous URLs, including those on disposable hosting and potentially malicious domains, supports the conclusion that this document is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://briarcliff68.com/clients/71184/File/84644349417.pdf In PDF document text
    • https://hchoanglong.vn/userfiles/file/sujederomovanefesowewa.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/79013399075.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/2e945d938c762aafe43010245e7c0385/givifijutugaguzigej.pdfIn PDF document text
    • https://adikkedua.com/contents//files/86893937514.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/63787053483.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf84562923---54019300959.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e4caa4df6---71847953640.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d4b07a9bf---kotiwiborisogiz.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d483c51a88---kozejikofebo.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/96170686533.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/77094222151.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c465ac4cc43fbd43aef0d7c8f67c99f1/bewop.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879f43c7e8e---pijudisoju.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qg0iflbh848tqas4foahtlmcq6/nutifokolafoletububuzojeg.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/18584501252.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/rikil.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607676a0845c4---28478689722.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/14431800256.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a1c9a8213---63148844694.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/gurizofubavobuwabiso.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e42a0a1e9---75822774008.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/8f2ca554c4a9fddd23c293bbbfe0216f/gavasuzifunibapezis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=putlockers+ant+man+and+the+waspPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 17852 bytes
SHA-256: be25a787bbe1bf004fa8f8ea3e299dbe748a31b0e4d399fadfd71b7884127745
font_01_sfnt_off00011f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F23 16080 bytes
SHA-256: d9b8130aa6f9633ab3de79ff31e2004108ab7689d1c7a99745aef320e0a208db
font_02_sfnt_off00013454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6B 10964 bytes
SHA-256: 24f6699da8986aabdb78dde6ce2cdedcd778076512ee8ec1e5935ada04be32f5

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