Malicious PDF — malware analysis report

Static analysis result for SHA-256 c609772365420be7…

MALICIOUS

PDF

86.8 KB Created: 2021-07-02 01:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c9c149c1bcd25d0a7791159d892b6261 SHA-1: d3f117fe6597c0fcba6c8a9450e6e6042708860e SHA-256: c609772365420be77090f2d41583d90e05fd34e97622ef07cbb7debc1eb5da1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://coretry.ru/uplcv?utm_term=lactated+ringers+nursing+considerations PDF link annotation
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c3b3088e---bujad.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/52671045359.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/a1a0313a992d9a4c16fb7883ec5ccf61/9946356157.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/b57210db50c095645730ce0b7784fa8c/41962147674.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e5e0184d7---45043942516.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2bd2ce3eb---vugom.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/guwira.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/6ga61ed69kl54j4bnq1cekn4c7/4905979115.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed6bc54508---bazilunidorawibaxitenure.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16091dcbd16c2f---69097406415.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/htnb3vkv2bbiffknu1bgdo96kj/38170416569.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/2eo6npkib5errrqjrgv8hc16tp/todekudojisopirojuvog.pdfIn PDF document text
    • https://activepymes.com/pub/file/29017672144.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ilub9417ghf5dfl97pdtbc669p/dobima.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/neguz.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f732f4c4ec---mitenubefepofowumare.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e27b924aa69b106de7da183ed6c4800e/31101389368.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/2it0jvuvh28maedu48evmth5sd/10387762359.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/zigulebikadunuzurepelos.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b72afb619aa---geruloge.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ab8222bd9d9d9c075cc8785fb5e3c84c/zozava.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/frrf40ail8vubt6c7589d7b4u2/sevepamalanebaxukote.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607214e6d67b2---pifetemaxufopukisaxivufu.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ifurilibixasavuluwu.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/foxusisam.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c554ba0f3f3cd16ea606c99d63b58ec6/12486530601.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/29637696319.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_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 16588 bytes
SHA-256: ad9c63460ce76a8a32c5716ccb94163332b8baddc1a2988c296d3d454ab12455
font_01_sfnt_off00011d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001359b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359B 10556 bytes
SHA-256: 1cc3e1563dad48778cb1c478e3df627bc7af278ad71d8850dbac230fc9a07aea

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