Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43c22e5e9f042bf…

MALICIOUS

PDF

89.4 KB Created: 2021-09-04 15:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3f950aeba033cd6d561f5b16b642a65 SHA-1: fd3bfe559ee22f265ec2f8c6c0102fb61dad6a71 SHA-256: a43c22e5e9f042bf95310710a20df1c002a20da89cf4a1c21020674aeb076180
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. ClamAV detection and ML classification strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af9266a40cf---pedofusuko.pdf In PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/bgekjoiq3tdrt8m1fcjnkcckct/71486741618.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/kokikukituro.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b618efc7---75749457696.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b9ab4ba2---3596516259.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fa5bfc52d1a---gasedogogo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6ad804583fdc6aee5bfac7e3c9b35094/55283829590.pdfIn PDF document text
    • http://mosjob.ru/images/file/derapidotelagabuni.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/gelotubikesurorebid.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/pedosez.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3ab263c38---lurujefukapolexanewe.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5020a20039---gevijevuranujibuli.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/kanodavesi.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/9c091b68c5ac9d40138a5811db7f0be7/bibalubotidedoxobur.pdfIn PDF document text
    • https://ocw.tw/uploads/files/nosodixibavedibivinowezuf.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210704_A6F6D5049382CE6A.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/40919319330.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/90747990828.pdfIn PDF document text
    • http://biomisszio.hu/tmp/dasoguje.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/10b7e1d305d154b9f57bc6da09696fe6/27213094869.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f15b4810c09---8562593678.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/27751183405.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/parapewamimonadu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaaad00504---xojomov.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/sowavexazokalukonefagifaj.pdfIn PDF document text
    • https://people11people.com/uploads/File/falefewufakoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=poesias+para+ni%C3%B1os+de+3+a+5+a%C3%B1os+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_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 19172 bytes
SHA-256: 517232755f60c0d4f4939c9c7508b3a11120dd95a1c90b1be7ddbc7d71789cf3
font_01_sfnt_off00012484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12484 10860 bytes
SHA-256: 98207d533fdb31f5315fa2ac460dbe75f5fef26647ef4279abd6bb9e2960fbf3
font_02_sfnt_off00013d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1