Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f936e5b00604318…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 06:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f4d734a682584960c0795b8e2c74b15f SHA-1: b658335c237a676d6101bf086e8c8440fe0cea61 SHA-256: 5f936e5b006043189ebe08c0ceba74bfa6092da1c00ec4d9590c42009644d72d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS uploads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The embedded JavaScript and link farm suggest an attempt to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://garglob.ru/uplcv?utm_term=extract+rar+files+android PDF link annotation
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/967c1e1e41748d70beac131c034a1f70/89358731396.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/4350095221.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/54297c778f69700286df342eeac4bd26/tuxuwetazigeviv.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a358863dfc19c3dcffa531086dc7ba5/dajoxix.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2009jikgi6iarm3p4ag8n2v4j7/941669905.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d1b5531dc97e7c4ba46469a9f477d16c/betagoxugabokudasofasoba.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f7d48b40c---sefimazabi.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210911052018.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/zeposesineguxasimesu.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/53631044989.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/jidesebep.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/51116465481.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/52251259005.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/65289588935.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/26931887167.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9c0eaba8c---28173190305.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/zisikuma.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/20268701284.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/waviluwabagi.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/27636359876.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/kopokitalidawaxi.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a20169218dbc0765d06892d47a3faf4/67605090442.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/85145612910.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/75545925893.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_off0000e443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE443 10556 bytes
SHA-256: 7cb1c230cd90ff2a6c583a4a97daddfa52d9e10931e3ccd392cdaef045b2f717
font_01_sfnt_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11488 17480 bytes
SHA-256: e7f416a51f6966c82a42199ffe085d5e767ee006f08277af6a8cd8a5b060c7f5