Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3281c67edd63b3…

MALICIOUS

PDF

76.3 KB Created: 2021-05-26 18:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: abe67f2a092d29a2200910d36a80d433 SHA-1: fe00792a3ad06b5c08f18317427e2b3d348bcafa SHA-256: da3281c67edd63b36a18a13482b5595e476ccec84344a9d27ce59ff8b105bde7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to compromised websites, many of which are hosted on disposable domains and utilize form-builder plugins for file uploads. The document body is obfuscated but appears to be a lure related to iPhone notification sounds, likely intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47621dafd---novasalipujaxizosu.pdf In PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608929dc1ab6f---sakotijupujukom.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5897e8d4bd150f6f15dc6938ae656eac/pamupoxitugolisanufavo.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/23178173000.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e4344839d802561cf09718275dcb22b7/20403749095.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/6eed78ad230c295e121aca59836661c2/29426095078.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/rkgbi47stuhb2tmf59bu72nsov/banubokukuvajazawuluna.pdfIn PDF document text
    • https://arerp.kr/data/file/%5C/71893879525.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/fapexusalekova.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/808f161611000925651df4d95269ecae/8059016943.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d379a8d245---vefesesekoduzomur.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ev1b1s70v6n23q0p76n9d5a5qi/vipufo.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb4a2d9222---repodajogodatonekesami.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+is+the+default+notification+sound+on+iphonePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 5160 bytes
SHA-256: 8f84fc84b33049fe09d1f6808e4254675defeff6942e596a7013193a3f8a8112
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 10696 bytes
SHA-256: c9a2f8955fb292530cbf22ff277bb1abb2219d2770f0d2a90d0e78096f2626c7
font_02_sfnt_off000114ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 3204 bytes
SHA-256: a2d2a73b31f614169c909b1bb91d4aa96e97aaa5bd1dbabfed78e01997b6b1f8