Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8d0209a2e4f30b…

MALICIOUS

PDF

84.9 KB Created: 2021-07-25 22:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0e36370e9019818da90c7957338cb080 SHA-1: 3537ddab4e42e3295944bd0a5496c2405cff4994 SHA-256: 4c8d0209a2e4f30b3bc406076fc5cc5f11bbf3e69ed5098687e46a3726d46cb5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL findings are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4c5facff7---fokaxoleduwofamuzogo.pdf In PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/38751767912.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/kudbjpeponfrkbfa8i5g0pi60o/femigasibipo.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/v3i5ru5494r2jgcj8rmmcahse0/vuwuvasafugekebam.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a73c6773f12---18485242214.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/af32afbcef9828c941aade6e34dc1dd0/84294872213.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/12616254894.pdfIn PDF document text
    • http://getvisa.ru/images/File/nedunizesavedur.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/19504935236.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fekikubuka.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/80959459793.pdfIn PDF document text
    • https://airshow-bg.com/file/mubikofevubinujetunezoteg.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/86924937118.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/90476868960.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nh4k3o34u97kmk1ok4t97tce43/29989418348.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e4425aaea5d---ganumelotodubakakubegoxem.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/pifudetekurusozubokopig.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/fdac020db6d86af6a59e4fd4d4c62bb0/68078462434.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/102534d43793ef2967df0b0138f41a64/16018650410.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aef264e25e---55502469656.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/12899554224.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16070efa2d9403---12874707349.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/lurofenesom.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f313c8735---81214899427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=stsi+scholarship+past+papers+pdf+downloadPDF 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_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 10880 bytes
SHA-256: 353d703854bebb3c116b8a5d6859e516e91cbf569382df1eb4378cdc136fe604
font_01_sfnt_off000100f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 16984 bytes
SHA-256: 7b811380718b527fdafbf2eb6514100abb46d4fbc70e03c6e14d014ef77cfb8c
font_02_sfnt_off00012d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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