Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5090b62d67015cd…

MALICIOUS

PDF

90.4 KB Created: 2021-07-06 22:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95d4191eb27302b70dc7333fef329d54 SHA-1: 4e599b65e70068cfffb8ad3fadcc583e678aa5b3 SHA-256: d5090b62d67015cd8e8b1e306f1b3004064ed479d62bf20efcf00d6d1d5d67ac
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this phishing or redirection tactic. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0de72dc0b3---31009086997.pdf In PDF document text
    • https://bhsbeacon.com/FCKeditor/file/55142295263.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/qbahun5rf4d8007pdqaqfptrsd/zorekebadarewexakoruwono.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160cff9ce4c075---mawotomajodijeviwobipowu.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160831be43af5c---62208685980.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd66c880e---61685773388.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/75620655302.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1997946365353ad6a73dee4fb36cbadf/judidigazidafopumib.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c4e23455defa0626fd4cd1af9886e182/2776172750.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954a55508e4---getibi.pdfIn PDF document text
    • http://arablift.net/userfiles/file/xunororipebo.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/xunuzuvise.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/38f9f647d130d84c5dc4f6c8f71d2eeb/menupitikanetemebudetivab.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/j1lftltt23knrr6l0t1kqkofo4/91139721133.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/vagojojejatixuvuvudagi.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/vivumuboxu.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8584b467cf---xisotirij.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/kituwolodixupuwi.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/dugapimikufededabigaliwiw.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/85797392103.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/litawosegagowitaloxosap.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/vrfln7oipp27rh7jh3rd330em1/jemeboduwaxuma.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/a368b5e8fee3990f3f97829e5d661e28/97850377060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hyrax+related+to+elephantPDF 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_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 19564 bytes
SHA-256: eaabfbe4c58bfe3d8a1ea6ee3dc8353598ba369473e9cf205e48f8957311f68c
font_01_sfnt_off00012b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14367 10436 bytes
SHA-256: 58f04a29e99bec4857e5aea11087cefaea358bcae4398929624ac3c7fa46734d

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