Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd48ed27cf97318a…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 04:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb7688ac2fbeb70b1dc6034c21ddef51 SHA-1: 6dd4dd8967101566b0431c82d9d5c50144bf2926 SHA-256: fd48ed27cf97318afefdf96b0bfc9d80f818c1f242792d5591ce5a05f305183e
156 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The ML classifier also strongly indicated maliciousness, supporting the phishing and trojan detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baracenter.be/userfiles/file/21595952106.pdf In PDF document text
    • http://dunajecbiala.pl/upload/File/11252839634.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/d4qi3s6og1b20jspd2a5ntjomb/bawiteb.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/reruzovavu.pdfIn PDF document text
    • http://atek-ent.com/upload/file/govuwowuforikitive.pdfIn PDF document text
    • http://elitacasa.it/images/file/dokifekux.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614db4758775a---95119511147.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/33887285025.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/kusaduberadonafexizegubo.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/11845782115.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/kobajozu.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/51001679181.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/8936401482.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/7304407231.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bee4b85dad---dosalemutofolafosikiw.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614273441dbe3---gudomubumokufenalid.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/zemurebopibulitot.pdfIn PDF document text
    • http://onhimalayas.com/ckfinder/userfiles/files/29635448701.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/2128566624.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/89681469295.pdfIn PDF document text
    • http://amkchem.com/upload/files/wivubavetumifaj.pdfIn PDF document text
    • http://superazs.ru/images/news/file/dizavefazukoladiralukog.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/23372010809.pdfIn PDF document text
    • https://rippa.pt/files/file/tanaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=sine+and+cosine+curvePDF 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_off0000b3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEB 17676 bytes
SHA-256: 711d87ae9f7db4bc1a8f1ca668d12b1a398407a93b48d6280887041accb5a20f
font_02_sfnt_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 10460 bytes
SHA-256: a59a20f770a88133ed0da46f82c4e75b85e3d7b322c6dbf2fbe9d7fdf2ceed6e