Malicious PDF — malware analysis report

Static analysis result for SHA-256 737dce18e35a9b67…

MALICIOUS

PDF

80.0 KB Created: 2021-09-02 02:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: baea7c16be37cadc3ecc29350a98f4e2 SHA-1: 34ae9064dd7758e01d1aac63a2fac76cd6db6a29 SHA-256: 737dce18e35a9b67f6d618d38a4455d339724447389977f475d8af63983b50df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external links were found, with several pointing to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chithanhplastics.com/uploads/userfiles/file/rakut.pdf In PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pizivopenekezedolofuli.pdfIn PDF document text
    • https://altbuket.ru/files/balemowobepuzefoxikediguf.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf981d56a7---9071372685.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b05d4c44c28---55921575224.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836c3049412---sakigajo.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100d1e1667d6---fisorepo.pdfIn PDF document text
    • https://btegypt.com/file/lopapisejigekibedatakatu.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/74718462460.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/84335928656.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/98324840112.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/b7a4c5f9ad12fa696b93ce2c1d678adb/nolefibip.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/nijemuvoburerosu.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/lejiwubelozitugobisifupa.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ca5872e53115c086a08a12b385f34ea8/25471100161.pdfIn PDF document text
    • http://www.celso.org/download/46062841074.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/3ogor1f9edbvsu53l0amkcm2o4/lukej.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/kijenu.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/xopagapupuzube.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16116bae7b3e61---nofimuxolimakotanudeti.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/vemasof.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/4273838185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=non+solicitation+clause+examplePDF 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_off0000d4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 17504 bytes
SHA-256: 0d3e146c6cf7eb767277adfc641de51b00e8cc012ca2b575e4c8a46480cb66ec
font_02_sfnt_off00011a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A31 10616 bytes
SHA-256: 7461e80d077f8423891f8477b5e0d6c24b873c10270f122da7f7f6ca0d24039f

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