Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b4be22e457f7f4…

MALICIOUS

PDF

90.1 KB Created: 2021-09-02 14:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4777fdb4d031398d4fd28d1732832cf SHA-1: 229611a7e502c54b3bc19ebde08c5213812d8243 SHA-256: c5b4be22e457f7f4d6f8f9caf7f4fa37ab97b01530a61bad6e7efc7bd1731ca4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of these links and the overall structure point towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0465768cf8f71b6525460c2e16f90b76/8023293268.pdf In PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcd4a388d8---jowisezilaworalavitar.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/78558204686.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/65f9561968541bbc9cd100ce7e8393c2/38690815421.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210512030307.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/bekozidamusa.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/najilepajipo.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/zujip.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/vinomuvivaxubekulebiluki.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/87355868632.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2bcfb6c34---luraribisogixina.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/1d136170126decbaad7d36001655637b/82322790627.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/jopekit.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd7943bd63---33120959060.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/52691069873.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/bowesuxozolamamamizekavir.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/48915333865.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/81973555138.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d7d6497e---83773558186.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/64411758800.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/90e45239c8be76ab05f480d18da0cb70/68653079642.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/64888606742.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609861745a440---sidul.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/481ce07c7d8a35e4e6f9c12792761b91/simimukasofuwumunesipap.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216763723579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=antagonistas+de+leucotrienos+pdfPDF 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_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001110d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110D 10876 bytes
SHA-256: 83c197a2a43aa66da0359b9ee28f868876b900af7ef2f5707d39228720607c1f
font_02_sfnt_off00012a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A23 18844 bytes
SHA-256: 7f130e7150d3e61ba457ce3348fd65fc7c38d93b8a4fe62c9c8715f77d675940

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