Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1d3f64f22bd005…

MALICIOUS

PDF

87.4 KB Created: 2021-09-01 07:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 568ec48242dc4bf247c7f07d5d9dc844 SHA-1: 66387ff272e442e76418805984047f10eb6776e9 SHA-256: 5d1d3f64f22bd005033269d004bd024a4788e4d2a4b0ea6c4ee66e10ddd11249
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are structured as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://nail-free.com/ckfinder/userfiles/files/98203091672.pdf In PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c66f10f461---dimunovob.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/26903721128.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/92869729203.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdf8a699c7---zunowi.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/98665707191.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/j7p0a21of9hqegg9kh508h8vr3/gajavag.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/verifawudewexumuzipab.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e3b72ad8827e9a952d093c1347ddbefd/wizuzafofawivaguve.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/loziban.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/nisevijera.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160807c313b669---tiged.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/mjc0604otn62fa0hd9nun521ul/wofomarabuwupivejef.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/39372978558.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/97142380574.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/30231256189.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/e7c275f9b98d09a49b6cb3f0ea75573e/52256060973.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/jitabufajalikinivegozit.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/akifexexi.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/31893575556.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/koruxakes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=amortization+rate+definitionPDF 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_004_off0000d724.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD724 18360 bytes
SHA-256: fe6a030cce3a1e6f7bc0bd98ffaf71e5932d07356b5efb165c677cd9129ebadd
font_01_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 10344 bytes
SHA-256: bc2bd5ccf938d7969345684426bab209a69edd64088c084ebc688e205028a701
font_02_sfnt_off00010acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 17108 bytes
SHA-256: 2bf5b6f4afbc1d20bc43235daaf847b069b6126916a3326fdd2a765333ebc08f
font_03_sfnt_off00013709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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