Malicious PDF — malware analysis report

Static analysis result for SHA-256 67aa74e72d6b3868…

MALICIOUS

PDF

73.5 KB Created: 2021-09-25 08:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84853705f0ca399c2e8b02f29b7be556 SHA-1: 87879c858be0551e35e3c1f2eabd2717d68dae80 SHA-256: 67aa74e72d6b3868cc0fb79486bebfcceddfe428b3a92a9a87ee26a5619a2c2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with a critical detection score. It contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to obscure the final malicious destination. The presence of embedded JavaScript indicates an intent to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://scuderia512.com/js/upload/files/5976748377.pdf In PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/soviwuzo.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///rekelupekemelaravov.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109092044311106.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/kibitagetazenuw.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/giwito.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/dumukujiposuvifij.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/96198692680.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307b2f891ba---43798544421.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/vesoketadalifa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff65bb8d08---47622108224.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/rejilerizudonepugel.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/65756398549.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/55152751999.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/zufomarijanunesova.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469ee58430f---65124879428.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/54891897234.pdfIn PDF document text
    • http://lulanjina.net/upload/files/15701675094.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/4842497637.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/lasuluvukovajomowoto.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210903222609.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/2090652607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=welche+offline+navi+app+f%C3%BCr+androidPDF 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_off0000b78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9C 18108 bytes
SHA-256: 8f942965fcb8648ec802e4d1f1b98e3b709c7133116299868a8c94cf3ee1ffc2
font_02_sfnt_off0000fe73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE73 10700 bytes
SHA-256: 8c48345adb5f2d22788991bffdbae3a564b252c42c6ece8ee8f931362b5bf557

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