Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2da9b729a977c44…

MALICIOUS

PDF

99.6 KB Created: 2021-08-18 04:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab42fd3c36cd69e15ba1461df3949796 SHA-1: 06683956ea9864d8f00d0fa3fd16247f17f2d4b5 SHA-256: a2da9b729a977c4400db722ffe6982f3ffa04111c8f6a10bb0e9b831bd0dde2c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a common phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://debsecond.net/UserFiles/File/nimelubedusoxuka.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097671610ad2---91203895182.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/suvufonabavapizewitab.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/vikibagoluregax.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/09cda31bc794f52bbb6aee7587c7e9f4/zujojilod.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/movibajafuvasuturumapuxi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/t1pqa25nkq0a92sb1g44bmcud4/93887144859.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160be87523e5b7---77756228088.pdfPDF link annotation
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53886c4057---33806533507.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7c09a9bd5ab4388cbce1026a4ae04e52/28900631567.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/fapanijivezesuduzos.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/30380151134.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/virofodijiset.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/50994538858.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63234d61b435eb7b143bafd77a5e7b82/28113427773.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086c599e88af---vuzexofivijaz.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/488c3b2604d426983cfc2028ab8dce4e/24823928237.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/6481265204.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bdff0dc2e---85140582956.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e97d83ed2---wazitojimun.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/68788494182.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/56578460027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mesaje+amuzante+pt+ravasePDF 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_off00011450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C62 19744 bytes
SHA-256: 1ea9029c6864e2de5be205d583c1d7d5eca7e9c988967cba791ba3839a6493f7
font_02_sfnt_off00015dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DCA 10504 bytes
SHA-256: ab76ad4d67ebd2ee89aff9b203befe18168cf4f9f67e23190fdf03935ae480d7
font_03_sfnt_off000175bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175BB 2624 bytes
SHA-256: 65d8f47eaebfac5a894ae1c1f39d059ec39bb17800d94e35543f356d11e8700e

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