Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb2e7aa846438fc…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 12:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b949d9f6fb651e5b9b4129c7502f9a5 SHA-1: 83d317141ee2bb80d1b11ac41c740edc80d01b10 SHA-256: acb2e7aa846438fcc9fc8d74e048accf0f1d4711278bff328bcb5abda0c042eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, directing users to other PDF files hosted on compromised websites. The primary purpose appears to be to lure users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=ac+market+clash+of+clans+hack+download PDF link annotation
    • https://7mark3t2-7aya.com/contents/files/57183473351.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/16413287863.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/3ferheap46gvjdhafvid1ebjr1/kegibukifafesoloroto.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/vavelezenipoguvamunufi.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/95812558324.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/kubulaxo.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/rodifubijorifizuwidumejob.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/zowizusinepemuwip.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebac2d4c67---falupajirogadodizew.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c355b28ea9---mekesemixizelugo.pdfIn PDF document text
    • http://castel.lu/userfiles/files/pixom.pdfIn PDF document text
    • https://ayurmitra.com/files/file/fafefasemabefefadanaj.pdfIn PDF document text
    • http://sdes.in/uploads/73822397187.pdfIn PDF document text
    • http://schokofontaene.de/idata/mevufejamolaveroxokeke.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/89096286992.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/18183923078.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/rutaxusetolewux.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/14702207346.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/9696a1e99ae9eff3e09d3b8feab22fbf/86270898246.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/98193230294.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/jevowitibunezexadanewamiw.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/nubolonigetekodeg.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/domiwuw.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_off0000d63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63D 17368 bytes
SHA-256: 35a16f764d3a419912faf34b08db22f839faf4c6f3ed21a4ceb5515f0697f1ca
font_01_sfnt_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5E 10808 bytes
SHA-256: b14d0e98c732d9f66790ed45f76c018a4f91c38304eb94d2a62bec86287e0064