Malicious PDF — malware analysis report

Static analysis result for SHA-256 1341376f91a1c943…

MALICIOUS

PDF

87.7 KB Created: 2021-07-31 02:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c02f287d9d24070e040df8c1c84d2228 SHA-1: e1bdce5229c6fade96de2ec8bfd0ba656fde0cd8 SHA-256: 1341376f91a1c943e77c21d53a7fceab11fa1b807f0bf40de1450c3603163e05
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further indicates a malicious intent to host or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ketchas.ru/uplcv?utm_term=traffic+racer+real+car+names PDF link annotation
    • http://seyrimerdin.com/userfiles/file/4345636435.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607037030f361---fuxubexogagogukata.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/30617157196.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/dnh09tv139rbaviaf3mko9j882/firisuxanonamax.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/ridetutijufuzotujupated.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/fifubiwugajupepivekoreze.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/3731a2c5032bd5fed21f90deb234a302/13544812021.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/79198833794.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/71401740805.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabba104325---kenebakesatokigor.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8751dfd60---xejelalo.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/rimenejopunapumepiberopor.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/7756435393.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a10b5be42c2---patotixizipitozuto.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/texinezakojikuvelopo.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/setowupazal.pdfIn PDF document text
    • http://119pump.net/d/files/12358437074.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/85823559383.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/girixujovifirida.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/53978707736.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aec3cd0b65e---bafitamanisuvukori.pdfIn PDF document text
    • https://tigaintan.com/contents//files/70237987021.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/gukg5a7gg32vqi48q5gt0kj8i6/60786831271.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_off0000f422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 17380 bytes
SHA-256: e86c8c5e37601da77d229b632b08e5fc56116f7afb45987889c70a65ca347ba2
font_02_sfnt_off00013948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13948 10240 bytes
SHA-256: 3aabc33d68f20aa3e3569b6e464bab22f8eeb24a5080da79ef0f375ab5f4ce91

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