Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13028d4e60a9852…

MALICIOUS

PDF

92.7 KB Created: 2021-08-24 08:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 430089adaee8b91a92e2ba83560c9843 SHA-1: 90399daef16be4fe041d015bbe82c66add5dcc0f SHA-256: e13028d4e60a9852b0fe13bdae0e546ef03a15b9de96d996b2fe6590c3031fc0
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links and the nature of the hosting domains suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://botroul.be/uploads/11870754737.pdf In PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/60r58ho150130se9nqbtn4urkb/12153448601.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/dazukadokedujujotefe.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/ginejavexibata.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/voketipogojusudadizulu.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/hklkltu3tmparetmmkoejhcfg1/penipupimugetalezu.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1055a8e47---8860272007.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/nuluf.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/wakalelafemasutefiru.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/luvag.pdfIn PDF document text
    • https://oferta.lt/i/File/feragumafosunuwoxexira.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/412fa303f17eba1a17ef4af11ed50f32/17496318122.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e44863ba18bebff83c7c245c9ce1de6c/dumexoso.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/44ebs9t353n9eaa89eplq5qdv1/85122587705.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/qujf0633p14974edko36s2q29q/12783163797.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/joful.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/846ff0f982c48eba4f39d200b65e1669/60574554709.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/kekan.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/tekokixavisep.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/rn12nert00aubh5e6j4qj1t190/73399930979.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/lifefaririvozetojavu.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b1eee21a---xuvutizumafeg.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/54879975347.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/34715774379.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088cd91e0080---71801864979.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/70103993770.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3743923a484a663e3a7a5e9e11ad4971/bobaluvumoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+definition+of+researchPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 16668 bytes
SHA-256: e67aa58e904de7f826a85e28ace4549d5eefc17ba23f91c70f2e389a0429d7ec
font_01_sfnt_off0001328a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328A 10580 bytes
SHA-256: e38b79f76861a2bd2c64b54feb46e1ed125dda66db43b64eaf3c03d74197d455
font_02_sfnt_off00014aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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