Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fff4f6d84b7b2c…

MALICIOUS

PDF

93.4 KB Created: 2021-07-31 08:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e7926e57c535f37b4ef6e13211224dcd SHA-1: 104919d3e11b8e9d1e5211735c0817b5b3e603aa SHA-256: 52fff4f6d84b7b2c75531a7f877afbef5d3c468701786ea58deb4fd6ab4b4b1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites, suggesting a link farm designed to distribute malware or lead users to phishing pages. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://archism.ru/uplcv?utm_term=landscape+live+wallpaper+apk+pro PDF link annotation
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fbbdbd4e5---mugabimipivegogurizub.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/v25tg3thvpqe9trd68jtgr285c/gedadefemabora.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/30802691277.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/diketobowagosusafutiko.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/77719b0a4c8d85cadbeb5b36111eec28/1400505037.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/nerotu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6a3a70832085db466c1218368daceb78/visuvo.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/67683258883.pdfIn PDF document text
    • http://infunplastic.com/d/files/21891907801.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade45680329---78102148887.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/19532468883.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/sajonutidabi.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/fofisale.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/vojapafunusofoxazi.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/21307588306.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160842b3d5fd65---81507697873.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/79418190177.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/61890797238.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/97977948349.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/magv2lr79a7hdn15080s8ub0j0/rapojematurusujoxafi.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/33205120677.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/549c864d6245eece44a3b6d1ac883afb/58672555852.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811845b156c---90339471534.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/19240145939.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbb61e17b5---falateziduvoxomotapukob.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/63875ab9b962884a2fdd08d029b79a82/44089498104.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off00010815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 17428 bytes
SHA-256: b15767c30c35d6de1f27f4aa6f965fc3bf5efc1c0b79d3b4eb994f7c4f21e7a2
font_02_sfnt_off00013621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13621 10608 bytes
SHA-256: 6afb265068f27b13669bddd50505acb55024595983a94bbee44cbb1991661cd7
font_03_sfnt_off00014e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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