Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c5dcc5e2545a18…

MALICIOUS

PDF

262.4 KB Created: 2021-07-03 15:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d72d162d272d766da76735b1bf716b13 SHA-1: cc3559c2da6a227e38268fa2dac7684c5679b48e SHA-256: 89c5dcc5e2545a181ee67669a2d7a7cb8fd40d221acd0cc36e63dc01493cd426
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links pointing to compromised WordPress sites, specifically within form upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9845

Heuristics 5

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=anarcho+individualism+flag
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099f366c8683---zakifadajexukegare.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/0aa92ca601987b33216b9c1f6dd283c4/83935086606.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b4f7db24---koxigivikat.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cce0b2d9eae---4692724119.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad266bae0a0---32916830223.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4g182i9rs5un0jqsc5lqvpmu97/nexef.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/5lfm1975lr69ma0jtn3e9850h4/verezisataw.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8613d3aa2---vuruzuzefobin.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/u1lk195ssf6bi4fu9k2dqhkvi1/6662130558.pdf
    • http://opuspoint.com/ckfinder/userfiles/files/jitotozudaw.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a5fa8b15---luvipiwaz.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160715a6e8973c---genegopej.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6c37ab8bb---58678317280.pdf
    • https://accuratesearch.com/userfiles/file/5035160568.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abaa01d014d---gesulimutawelowukarumuvu.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088542659d84---97713467929.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210602093041.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080a78c55434---rukipoza.pdf
    • http://bsp-oblspl.org/ckfinder/userfiles/files/54683340048.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3666b17b---15208270414.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5349be69d---72586743693.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae860bfddc---seromibanutolesafuwi.pdf
    • https://triangle-electronics.com/assets/userfiles/file/namofuwivuje.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003a6ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x3A6EC 16792 bytes
font_01_sfnt_off0003bf03.bin
259509b07dbc1ced7f6c2f787a593de7f9f3805caf180c29d6fa2698c94cc554
pdf-font-stream PDF embedded font (sfnt) at offset 0x3BF03 10840 bytes
font_02_sfnt_off0003d79d.bin
41cec137f5374ab2ed82fe1f220a6077042d9583841f86f9676e61cf5ddecefe
pdf-font-stream PDF embedded font (sfnt) at offset 0x3D79D 21504 bytes