Malicious PDF — malware analysis report

Static analysis result for SHA-256 77db41583c2ab6a0…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 00:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: efca21dd775ad3aecb18fe0352ed9c96 SHA-1: 79b6768c4626dd09c9c206857c8b5f9b9f8e81d2 SHA-256: 77db41583c2ab6a08ce61ef1515d0165fcaf24f008f0118231950ca4b1960554
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=how+do+i+clear+the+trash+on+my+android+phone PDF link annotation
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142573b77fdd---pufegaxajefogewe.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e62f53477d---91100600692.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/42648646431.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eee8dc6c7a---fivixaxepemufidajifar.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/34401417986.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/93056659721.pdfIn PDF document text
    • http://fgosvo.ru/files/files/jivudewawigenog.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/89823640868.pdfIn PDF document text
    • http://arucax.am/user_images/file/jabobimowi.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/90785296595.pdfIn PDF document text
    • http://trubaopt.ru/content/file/tekokalujelemirowumunidij.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/buresiwaguveb.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/47230334031.pdfIn PDF document text
    • http://jonme.net/ckupload/files/wunamosotoz.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/mizogasuxafimi.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/dibekobisenusejazib.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/20284965982.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16136209144968---ruzugokoxugome.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/kapaketukomerewok.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/nezadakewu.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/42542792128.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/20a6dd71fb91fe49afc5e945d5f83059/72525651557.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c83a15eb2---3721195350.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/relivabob.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/84516458179.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_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 10968 bytes
SHA-256: ff8ccd34e37c672869d27f492f62ffc3cbc00455ac746754834fe9eb4d4753b2
font_02_sfnt_off000118e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E8 17620 bytes
SHA-256: f8e23b95686e2b69568441e76cdcb17f898c67ca0acabfaeea66a1fe7e7299bc

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