Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c87f53bbce0fed6…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 03:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 373cbe9ae463ea70de589f60ea2d93ac SHA-1: 99dc7e2a0d9a115e5a658914a65172fc8af4fd25 SHA-256: 2c87f53bbce0fed6593339c2e40acc52dc618dbdb8bbfc6ebae26f48ed84953c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://soc-in.com/data/media/files/71830707590.pdf In PDF document text
    • http://szilasfood.hu/pic_upload/files/4575595885.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/xurideken.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/39187749474.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd6d45c73d---45522656772.pdfIn PDF document text
    • http://langmypham.com/luutru/files/61635869247.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/neviwixiwusubitikedumiw.pdfIn PDF document text
    • http://ternovykh.ru/content/file/didijemelebofurixeguwe.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/jesuworuvomasuwebunesodu.pdfIn PDF document text
    • http://tzsunup.com/upload/molasuvuxe.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c862ff96---rasoditasuboparisoj.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/78143478438.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/78623931077.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/64332704409.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/73998898431.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139de80693cc---baxulebigi.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/498003618.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/63896440431.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7nk5m29q0jdi9e4lar92mkgo8b/fibenimovejixu.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/vowolufoxu.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/87938623010.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/91908132696.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/xoruvufenulex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+download+gratis+pocket+editionPDF 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_off0000d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 18484 bytes
SHA-256: 4e65b2e0cef5c182280472a16a7952bfa4cfc282b2f839e08c167c82eb6cdab9
font_01_sfnt_off000107aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 10964 bytes
SHA-256: 5babe876a5176bff25e65859ef8df56fb17ebd957a53cdef34e3693008266641