Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d2573b4f3c4f27e…

MALICIOUS

PDF

87.3 KB Created: 2021-07-17 10:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5192edc98c20389e6fb32ec895a4904 SHA-1: 61a78b2c04519b4a89d8b25c0e8b25a0b62ff0fd SHA-256: 1d2573b4f3c4f27e586a19319057c7f8e1ad6fb8b4e3dadaf2f464c22a6baf6e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct hosts, many of which are hosted on disposable domains or compromised CMS uploads. This suggests an attempt to distribute malicious content or phish for credentials through a network of deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://elcampoeco.org/FCKeditor/file/65596022022.pdf In PDF document text
    • https://amatnieks.lv/pictures/image/55205053023.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/xibipoxejutodo.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/munusamupesusufatotakipa.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/29o2k30h6ma2mfcebtgq6vuc8m/lebenuroxulixapu.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/78840728888.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/cc105b0a50f2f5711a42b691c63011a9/43631382871.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/93294207014.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948222123eb---27966225798.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/85e6eb8760e7cf4607c97fa11369a7a3/repufuvawutizupisodugo.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/85272011632.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725091da157---11493860689.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/0g6i82e1kam87ikiiolkapf2au/28734490884.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2348a628a---71117443266.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983156a810b---69164850762.pdfIn PDF document text
    • http://centrons.com/uploaded/file/54704456660d184c1e2212.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eca42491cf2---97373212206.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/bevutujetimotewejikuretov.pdfIn PDF document text
    • https://luminex.pl/upload/file/rujifogunezifagamuzixow.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b03f81d1d---dosapimunajexeruna.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/it2taqp87qd4afpg52dutf3br4/popogetarefibogidujaguna.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/8938380434.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/piwojuwaruziga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cattleya+orchid+leaves+turning+yellowPDF 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_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 11048 bytes
SHA-256: cc45c991517c8d32e146936bec6884dba4dfd683643cb14e069d8009a45233ce
font_01_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE5 17644 bytes
SHA-256: 89cabda967b03677e1725d5322f6e85d550329d9d4310cd5ffc396655626f44b

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