Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7abdfd4b6035a2…

MALICIOUS

PDF

91.5 KB Created: 2021-07-03 05:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2a676debff18e971a495fd829f2866b1 SHA-1: 778ff7e4939b5650143898e4a72e1a354d9ecaf3 SHA-256: ec7abdfd4b6035a2f9eb34027faeacdfcb9a7c23e7e514ca2ef2e1958bd98ffd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to download content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL findings point to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ed0dc679c394998fef907eaf91774726/bomegomupodidopi.pdf In PDF document text
    • https://avayemehr-carpet.ir/data/file/28652545696.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/tenunaku.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/d0o6vg79afepu17gcvamk1nqej/xotogeki.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/zemesurodutikar.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/welogopapupudoxinu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb9d11f290---zawowavoluwusisedupo.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c206e1440---wemasubasuwolurimuviwalo.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160777f9bafe35---2376254723.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3dc3bc345c---rudijunixiwalot.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/77530929418.pdfIn PDF document text
    • https://andrejc.si/files/file/medojulufivimukerutebed.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/29636525819.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ac207a17---83920687180.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/o0rhlgfvied7v3b72opomojpn7/nuwuv.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/79558750384.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/69809968997.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/vudov.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/71508406749.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/mudisalajugimuziwowegogo.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/tenusadapo.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090c55fe4e5d---wokufedixuvuwixesegamur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c883f2d3ce---juxeganisisalegi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/bf1ba0b523df3a9b9204126d346756d7/niduzazetineli.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff91139a2c---bezevimakobetoposipuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=calligraphy+drill+sheetsPDF 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://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_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 10592 bytes
SHA-256: 19a784c68ed9ad0ac4b7d13d0e0198276e8b2e0b8f2887edf62ea930a413ae15
font_01_sfnt_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCF 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off00013141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13141 17992 bytes
SHA-256: 5094ea38c20a27564fbe01d5b27ae66ce916370d73d6da823ae77690240f0102

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