Malicious PDF — malware analysis report

Static analysis result for SHA-256 5579c27c0a651bba…

MALICIOUS

PDF

104.0 KB Created: 2021-07-30 22:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51327804d5361b0850d57c96be07dc90 SHA-1: deb1862aa7b2f4a6aed334eb79b6f86a947ccc50 SHA-256: 5579c27c0a651bba2117c8bad850ea183d16ec468d2226fee6d4539c0d34cde9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or appear to be disposable. The primary purpose seems to be directing users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://drironcat.com/images/file/xirunokin.pdf In PDF document text
    • https://west-holding.com/userfiles/file/gejafot.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a14c704df8---nabobixevomakuxe.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/4949961457.pdfIn PDF document text
    • http://kccmaul.com/files/files/jasiboxawixumoreraxajosag.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/buvisalirer.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e45e0b03135---tujerarogatu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607011709bb82---zoburaropeb.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/93443041544.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/16746967953.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/20841421286.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58908140660.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1996eb0a27---tugadinuziposokak.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/24129964075.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd7fa903c---67471091063.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7166023d5---79527852350.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca5f274838---49867331026.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b3720d972e7616d43f9350dddde76d65/lufarelufupevuvalotipusex.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e693247526e---90233524546.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/detibonuturafapor.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a71b39dc9b5---zenobanebip.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/24c97bf9a522b8c4b95226a7d269e301/nuwarobipelibofateri.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d481019bd93---luwivis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=t%C3%A9l%C3%A9charger+musique+marocaine+mp3+gratuitement+legalementPDF 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
stream_008_off00015b15.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15B15 17452 bytes
SHA-256: fdd649ddeeeafd202c00924c2c80d15e7f03f2fff084afa68cc60f6ee3e174aa
font_00_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 22476 bytes
SHA-256: 220ea5fae14ab220c6488d771b6f62fe9822edb3599c5cf2ef9466f8cb4259ce
font_01_sfnt_off0001411a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411A 11356 bytes
SHA-256: 9dd0e4d8790e6202f2e04b4b75eb62013506ae91522127c8fec6880eab25f8ac
font_03_sfnt_off00017523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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