Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec860c752f457eb9…

MALICIOUS

PDF

94.3 KB Created: 2021-08-02 18:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d305dbd987a330b66c67a8f1c9ed708 SHA-1: 899e6d47b526401ad3b6ac3c348534d9ad519967 SHA-256: ec860c752f457eb9ab6afc4775590e82ad5f5fdc535f042d2330663b929844ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/omtd0bah1adr2n02rv4kt43aku/54008856560.pdf In PDF document text
    • http://byecook.com/ckupload/files/xirowonowum.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/28261192924.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/22806504260.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/mimejekawufatobofez.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/61600796401.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/jolatubevikitotusufiver.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c117781e2f---gewutenuzisope.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/grdn638tgr6m1t5db34vh54g57/lunusas.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/48068465795.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b2d96a9ac---zivukasanuwoke.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/vofuzejometixoruzile.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/72c4c977fb4f886694ee52daaeaabe74/91237913419.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/lobawarurakilezifixekole.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c940861878---60523520139.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d62df79e1d---dajofarofowe.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/65969523999.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/egp8stns5b6elflr9ma1fal9i2/fapetapipidovuwagobekum.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052921332313.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ds6c2dtp3dkn7oqcvfcsaiuii3/89946604685.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ulg4tuuttb0pihoetjunhagm5u/25752224055.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210504112921_1356069914.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/5554660669.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/65146007137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=simulink+half+wave+rectifierPDF 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_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 10732 bytes
SHA-256: 8d9d65210fe688e6fbd33ec2fbe95d5879c0ca17b53669bd7362116a20df1aad
font_02_sfnt_off00012011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 17812 bytes
SHA-256: 8ec61b1e0961dd71d54fe01405233a37c228f317cb453075613026f287052a1c
font_03_sfnt_off00013b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6B 16968 bytes
SHA-256: 25a6615f8764ae9415e3a61bdac2e90f38d18ac28412f07025a26578f2a0f98f

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