Malicious PDF — malware analysis report

Static analysis result for SHA-256 22bcb17a98ece6ef…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 19:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a2ad6e599abc3897649de075b339d94e SHA-1: 3d157b2edf7afa3d4a57a80f459859932d9d638c SHA-256: 22bcb17a98ece6ef15d68a5967fa75b28ea25e83c0174ccd095d8ed481564c0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=walgreens+online+job+application+pdf PDF link annotation
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/13876451756.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a644989747e---bomuzulatosifuvuxober.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/71372993041.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/xezazufamoliraviletuzaj.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/64545135595.pdfIn PDF document text
    • http://erictex.com/ufiles/files/36353222049.pdfIn PDF document text
    • http://gabortech.com/admin/file/37838387839.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/27984162069.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/b09ss78p7oqu81lff7su1vaao2/7169865941.pdfIn PDF document text
    • http://ruihuitax.com/files/file/zoguzijowanixazatedaribul.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/jinutivosuwawazuxodopo.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/lasedamokajanumipovunozi.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/64180812460.pdfIn PDF document text
    • https://campermagazine.tv/public/file/7339852870.pdfIn PDF document text
    • http://palami.by/images/file/88842702258.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7e3f20f88bd4d52eb3fd445ff5e47260/46534864689.pdfIn PDF document text
    • http://peoplefoster.com/pliki/7736481948.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/99626529989.pdfIn PDF document text
    • http://jucal.es/images/file/35528828033.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ec53172e5a07f853ae52c3f37ef9ade5/10033029752.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/70462838358.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/10037789248.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/73950089360.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_off0000e8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 17764 bytes
SHA-256: bb8b08792bdb22f598208b69c8f96566c3f08eccc2eac94c69fb2c1a8291a7e4
font_01_sfnt_off00011709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 11056 bytes
SHA-256: 55764dc32ed45323915b72abf98f2b9953178c45dbf63386fac9191e221e7e5d
font_02_sfnt_off0001306f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1