Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5eb6db2b8dc7797…

MALICIOUS

PDF

80.0 KB Created: 2021-10-09 00:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f316d224e2fa6030124352a8e9f0a938 SHA-1: 8a2535155521fd980893bae886a8e73766dcb60e SHA-256: a5eb6db2b8dc7797b9ae228d6b7ca93e6918120beeca169a9d5e05a1778e8c07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains an embedded JavaScript stream and multiple URLs, including one pointing to a compromised WordPress upload directory. The presence of JavaScript and the link farm suggest an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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 https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ad06598f690be20bc70aeb8107014d54/lefesuwirusoparagiruf.pdf In PDF document text
    • http://yucehukuk.com/resimler/files/62137763163.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/wifiniwapo.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/21993698299.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1ad1b6c21b9e65e2f51c72b2bf85952c/kufezuwan.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/98319377812.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/1562490855.pdfIn PDF document text
    • http://vecsecity.info/editor_up/96099846529.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210908032654.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/raxasimivekodizade.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/fufigekamapafu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8f89dd44fcf453f9880c802740a3c587/kujegizatozijukenek.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/27969528811.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/14570354476.pdfIn PDF document text
    • http://falconltd.pl/cache/file/zodaxuxaxul.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/vopififa.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/11480227597.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/zojukibepubonipeta.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/xigera.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/44450812558.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/23708888767.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/tumurazazavulilofepod.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/57588519152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=screen+recorder+for+laptop+windows+10+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD173 18296 bytes
SHA-256: 70212d91adcbf90c448dc8fe102cb9d7e0b32b3c66d923a3ffc8f161a6107f68
font_01_sfnt_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DA 10948 bytes
SHA-256: 9f183d0603b9a68c3a2e0323d96feee2cb1cea10f3d81723698465b6f997c3c4

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