Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c035360a5410e5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 19:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2a0998f7ee6d1024f10dd5e18b21127 SHA-1: bdb3fdfb4cf91ac45388627734a119208e792c4f SHA-256: 47c035360a5410e53b610270b9e5df2dcd256ad69ace94a059983e4560ae0caa
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://akkoryazilim.com/userfiles/file/55862359730.pdf In PDF document text
    • http://all-premium.com/user_file/files/fewuwimemalesij.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/mulowiwanumomipatexujo.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/89075652327.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45893611110.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///jibitapokivope.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/widagoxupis.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/55629146454.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/78694479736.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/sebevakudilo.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/45285812215.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/474064782.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/siwedilebaxepabopakuga.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130de671d753---86277565015.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/93711324765.pdfIn PDF document text
    • http://saimiri.name/upload/file/2317981503.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/darutaramefusobesuzivaxex.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134a03e44017---8266632041.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630963762.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/529641fa7200b111b8e0ac978c662ebf/75936980170.pdfIn PDF document text
    • https://kenadong.com/contents/files/napovifo.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/76138113682.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/7hgv78r77bpsmpvv8eep7oft88/bumerejozusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mx+share+karo+apk+download+for+laptopPDF 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_off0000d529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD529 10776 bytes
SHA-256: 5323fe31515b87152c87460bd8c382ebefcaf132d4e8ceecebd75b7c8ab7da89
font_01_sfnt_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001061b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 17688 bytes
SHA-256: 2265885abe7ce0e00d269e2f9774f8b3782c28e17b1095c862092a183e149e2c