Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9025bd5929216e…

MALICIOUS

PDF

107.6 KB Created: 2021-08-12 12:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 41965b0515bb6a60f790610dded48f66 SHA-1: 4a2772b6f20933ad8ea68801ce157b0b4146c425 SHA-256: 9f9025bd5929216eeeb42e4943e32d0bd6379760b2c087859d412f58654eaecd
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting a marketing or phishing lure, strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crysiq.ru/uplcv?utm_term=descargar+libro+azteca+pdf+gratis+un+servicio+al+jefe PDF link annotation
    • http://michalbaryza.pl/ckfinder/userfiles/files/pisuregaxogif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7003d61fa---6623721719.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/rugojalejapugi.pdfIn PDF document text
    • http://fittbike.hu/files/file/23263356455.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/nilokemuwosudu.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789ecc1e73c---51982955226.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/wimexisovodo.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2bf88f86bdb51307ba0b72cff200af5e/20602113114.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16096c774b5095---laget.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ea26073d8---fejojofuzifawum.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c891151c5---10650843989.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/xulor.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/xejigeganujoxufezobidunu.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/14899088568.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/94910597297.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074285f1e5bd---kemukinux.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210618134840.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/46873060391.pdfIn PDF document text
    • http://gtshotel.it/images/file/bipevefipag.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/newixabuwavasavimup.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-22/20210522174257831075.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_off00013d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D48 11292 bytes
SHA-256: 84253a00a72ee3a9127b654c40ba8360eb96f04abcb2faf684ff4eabb31dfc3a
font_01_sfnt_off00015796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FA8 18996 bytes
SHA-256: c8759989d0c6612d1dd2c4f317f1628be0095fc004737f5dd980fc2a78ac4a24

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