Malicious PDF — malware analysis report

Static analysis result for SHA-256 17047380dde2d848…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 13:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16959da281c63628e72c09bfb1867430 SHA-1: 28dc5497d93c90490949e7f6b14df803db9147bf SHA-256: 17047380dde2d848076c323cc69db1e3f9f58d11c8639e00ca856fa5edbb04b2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to further malicious content, such as phishing pages or malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/f8fc82c9dbe4478e01ffe76942e1f0fe/paludavuvadogadob.pdf In PDF document text
    • http://vksraja.in/fckeditor/upload/file/pezekuwunotaxikoduvele.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9f6b5296a---49746624053.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c6a2de92d---vabuzepelusinu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e2545c04e57b76b60864d5e00ee12308/22825389562.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8ce5422710009f05b5c085e584b0209e/wefevu.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/efc462b498e75b7cfd94bb984b845014/92895806363.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/23555251199.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/navetiga.pdfIn PDF document text
    • http://spiregene.com/image/files/20210709_173817.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/3749838501.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/70444177116.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609de35f2092d---57561804717.pdfIn PDF document text
    • https://sharenkon.com/files/77297092963.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a9c2747f1---nebuzijilobe.pdfIn PDF document text
    • http://iwishop.hu/file/mofamaxewoxe.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/semabonom.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/divolijoxogutafonikotixam.pdfIn PDF document text
    • http://siembra.me/uploads/files/mugepomidutawijewipova.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/lirejexulujegisaliforok.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/fajim9dvpj00c6ff71m4ctin36/juvid.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/xovokevugiz.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/xalerej.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/99152947636.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/41375726273.pdfIn PDF document text
    • https://senfina.top/uploads/files/90601174445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=committee+chairperson+responsibilitiesPDF 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_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 10808 bytes
SHA-256: ccee67864c562ce74c434dcc771982080812b3dc69f78dd3e8c897e164b61376
font_02_sfnt_off000105c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C9 17184 bytes
SHA-256: e972a7aad87bf376cc55db93c666b07516d999a64a54d147a377f4977484a6a9

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