Malicious PDF — malware analysis report

Static analysis result for SHA-256 c886872e506be786…

MALICIOUS

PDF

75.2 KB Created: 2021-09-07 10:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f16bd63600b36fe0f0163dc3a1e7da24 SHA-1: 16b32c4fd289c3728372eb43e7fc5c33ce64e131 SHA-256: c886872e506be786e41c1a9b070fab6d246b69a55e2dc53e9875382f2ab0244a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised CMS upload directories. This suggests an attempt to distribute malicious content or engage in phishing, disguised as a seemingly innocuous document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://iohrp.org/f_files/files/sojunofi.pdf In PDF document text
    • http://obasekiestates.com/UserFiles/file/96827536803.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/80313b90916c53fb0e4e202d256e1f2e/gawokima.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2e94ecc0fca712e33473de48ef2a5b5a/teponunudivijetibu.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/lopilutejigivuxep.pdfIn PDF document text
    • http://weingut-suppan.at/files/bivunupoleluvaxiwodi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/47c48fddde7d2c068daf99720a0e7c2c/99073321439.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f113fa60083---89451488527.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/17cf6ddd6f38ca4bd37c8bc833054601/lujok.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/nukataj.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/didise.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0de54a9836---nabunixuwirikilaw.pdfIn PDF document text
    • http://hainfelderteich.at/11723047607.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/xenaxuwapor.pdfIn PDF document text
    • https://windsbs.biz/files/file/topotexob.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607685fd5166b---munavuwowa.pdfIn PDF document text
    • http://zae.me/datafiles/file/bubosizewuvuv.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/m3ookcgj7iemb8l3hhs0h3hb73/38598794041.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/57899571347.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/duwoxenuro.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ktkg1clubmuugb7i7s1ht18lf0/minaged.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/7js73g86ruv62aqpi06fha2gm3/wotunikamubogel.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/93678764507.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2fc297474---31393818300.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/teweta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=roadcraft+motorcycle+pdfPDF 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_off0000c5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 10576 bytes
SHA-256: ebde131ff47b5550e097fb1d4e01a3532d11de2278490b9b99bbfbe2cc008aa7
font_02_sfnt_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 15996 bytes
SHA-256: 84b7dd9178927be532b6871671e4442d6a0e4c919b6fef904798b9747494a903

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