Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a515bcd908fc48…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 19:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41fc3742c36fad42b3d48ebfc7d7f139 SHA-1: 701b33ac8d132333078d73d35be483c0a262d7eb SHA-256: 40a515bcd908fc48016331b03bb1176fd204b40679f9a43eab17f9308ebb9ec9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to manipulate search engine results or engage in SEO poisoning to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://drafthe.ru/uplcv?utm_term=precio+cizalla+manual+usada PDF link annotation
    • https://eccdc.org/application/webroot/userfiles/file/tuvopedijupukarefufepol.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/25875694106.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/bidetitos.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/8411470983.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/67488125651.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/fefox.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/39605259900.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/52795401847.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/fubekas.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/98985524056.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613613e98b5d0---zotanujer.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/fupebosaxijoxobozuwu.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/67437319977.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/83256575378.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/41043185370.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/85189628189.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/woxasewe.pdfIn PDF document text
    • http://asqcert.net/files/files/70815189031.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16131045f23f04---vikiputilexaravep.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/36e4bbc3a4c33675391865d72b357890/nariro.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/zasikulivogifox.pdfIn PDF document text
    • http://sivam.pl/files/file/83012504346.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/kogulimozatuxasaboteba.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/mqko0e012uupi56nqv8jn2evc9/taviv.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/zovavifegugimedo.pdfIn PDF document text
    • http://crm333.com/documentos/file/12346478509.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_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 10596 bytes
SHA-256: b6df58bed426b56b4620b06d33d50e994945bc1b678f5aaf344f7ff4908f1d5b
font_02_sfnt_off0001126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126A 19356 bytes
SHA-256: 866064f4cada3d62d6281bc30ba3e004a77e7573a480de7f45b07db3b7a5e8f5