Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28ce60e8927e0b1…

MALICIOUS

PDF

82.8 KB Created: 2021-07-22 02:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7bb24dfe3c51f9d69905ee471f81bc61 SHA-1: f4e7f8e306d4ce31df20e4197dbd90cfd6d88784 SHA-256: c28ce60e8927e0b1cb7e35bc5bf631a1f36ccee66f9afcac3d51d664a850d5ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as a link farm to obscure their true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://beijingbeat.com/contents//files/vuxaxumixaxakiniw.pdf In PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/notugezukonamejusozule.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73bc9003f---mudefutepa.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609afd29eb1d6---davudegezugazegalagus.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d55c2d25e1b---sobozisosutoxebaseti.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/7456890733.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/mitivewawekunus.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/kosukexeradogorususuguwej.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/jikusavajosep.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/8510600698.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2bf4c0a45---saneduvogojaporivuta.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/rekakovejusufemokap.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/sikurip.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/domupiwabebitefeku.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2b788993c---43825518157.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/af37af74fd6a3030886e25d38a0aa13a/10499377343.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/78892993430.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/xejuxoxewoxizop.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/durabemumi.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925c640c082---vumumabalekikadafefi.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/vapodijesexex.pdfIn PDF document text
    • http://babamoleskine.com/files/file/80215825582.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/6ec1cfc4ba39cc0e64cc633dbeaeefac/98556296272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=chromedriver+win64+downloadPDF 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_off0000d536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 1728 bytes
SHA-256: 8bc175f4a4f5cac64792babdad517d65aba3552260b022de7cd4c86cbad4686c
font_01_sfnt_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 10676 bytes
SHA-256: 264e74a6833a684684c37c665dcf2ea12eb79fe47d3599b347555de570f3db16
font_02_sfnt_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 17684 bytes
SHA-256: ebb2956d1f338fe0d239eded8df22ecfa3e0d8a871904172af2212705cf3fca8
font_03_sfnt_off000122a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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