Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31cc50704011373…

MALICIOUS

PDF

90.7 KB Created: 2021-08-17 19:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10d27880b97bb97f8de8a8074edd1964 SHA-1: fa6fb06d606bfc649449ee8c221051017ffdfc4d SHA-256: b31cc507040113733456d1cedcc10f3370e7b81da304d21cfc39a29752d8e004
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to phishing sites or other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=how+to+get+more+followers+on+tiktok+without+an+app PDF link annotation
    • http://caopump.com/admin/userfiles/file/wajasor.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0bb25cac618d0c819ad10fd6b8f9355c/25609073656.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607848054c779---tulupisanenojog.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db9d2bb9002---ziwodavo.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a6209a59790f4b7a0bbe5d546bc572c3/polomujomutimofijibu.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/jewutetokiputavi.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/zevagixiputufelugamidemu.pdfIn PDF document text
    • https://filetorme.com/upload/files/20584267152.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608717fabd357---lunuzuvifozozubux.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/qnmr93158eadtok8l1al7r3rud/5329887597.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/gebelezixuzegun.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/160447a3b3fc7e36adf2b3c3da5421cd/kopupoxadototelevuf.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/27459158684.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/zemewepadudugi.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/99821358327.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/1050502419.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/vunijegu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae93c4acf37---xotudozu.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/28678062957.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/salug.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/49370766090.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/d95i2hdcgiv7hat5kbmlvrp66e/31526267199.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8db6dd23d---79931959630.pdfIn PDF document text
    • https://hoongnau.com/upload/files/pakeguza.pdfIn PDF document text
    • 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_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 17632 bytes
SHA-256: 8822120ad080b4ad8e1722357e5d91e0e97bb721dba9cf75a0f0760a254493ed
font_01_sfnt_off00012963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12963 11076 bytes
SHA-256: f630458a55265cd871bb05a46c7c37228efe04e52aeda86400e0a2f586ac7511
font_02_sfnt_off00014307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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