Malicious PDF — malware analysis report

Static analysis result for SHA-256 37565d5f0dc381b3…

MALICIOUS

PDF

89.5 KB Created: 2021-07-03 11:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 25752122745f0fe950ed52aff570d9a2 SHA-1: 145e77d2faf66527ea46f8c3094d000f5cdaf6f2 SHA-256: 37565d5f0dc381b3dd6cc82c8487bb8e98c0d98453512ab61599714cc3face3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a link farm pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV also identified it as a phishing trojan. While no scripts were extracted, the structure suggests it is designed to redirect users to potentially harmful external URLs, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dejavuruse.com/userfiles/file/97799466762.pdf In PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/069369f67e2ab0a18a6343ffbf7df580/26114626670.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/faxazedenimazegavewiwa.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7f9f78628263ccd6436d38db10ab3146/kiwazedifelonibutirinaxa.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/aafdfp9ishdtg09cp1gl6ljluc/zuxawabasir.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/xotamixetazuketalasezuto.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/75805095245.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/9e3636102c7be413630d6faf0e84f194/meveboxalujigifodubagiter.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28011b6eb7---kuwinubolamuligatopejokiw.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/29992073701.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/28080101186.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607df724b0951---91424274938.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/tozefo.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/temumew.pdfIn PDF document text
    • https://windsbs.biz/files/file/fawug.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af72c7873b1---95866786810.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/tesibatisixenares.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa222ec91a---68077972274.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c26e6da1b---nodebafoxu.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/xanafawirajoje.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42650482e2e57c94dc8ff9df85672f26/fawofudolinajurit.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/dm9btm7bifa54l4kerb92g7k43/jumakulaxatujunivuk.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/v8f72bb0nff247r0sddhfh9at9/40550917127.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/1271242549.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfe8a73326---89908324604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=asl+who+what+when+where+whyPDF 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_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA6 10296 bytes
SHA-256: 94880de9e7606aad3a92e4741aaada9233c8e46f229d1a8e00cbd9aa32ede77b
font_02_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 18284 bytes
SHA-256: 7aec371f461fb3cd48291fd82bc046f0ae2d3a980cc0ac699ccf36d4560fd0a7