Malicious PDF — malware analysis report

Static analysis result for SHA-256 c934e1d7ce14f7ab…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 14:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0b06a40230548b059463c6f0493dbf2 SHA-1: 52e76ba5af522873751a0016cbdd6a32632457e4 SHA-256: c934e1d7ce14f7ab3ca69679509fddb04d0acb27ba13171469e4f2d1001e3a50
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish for credentials. The embedded URLs, such as the one pointing to a compromised WordPress upload, are key indicators of this malicious activity.

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 https://lrsinc.co/userfiles/file/lukovutemovapujoxumivozeb.pdf In PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/fb7131b4115ed1afdae864d24827f6a0/rovixojulotomokenif.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/pozomolegojarifadusuma.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/fivililuxuw.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/lewukoxedafamabegofozob.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/xubowigivubedis.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/12417026467.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/43796888608.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/61778186472.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/gezigorutelazi.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/poguxuzanuvosuzagak.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/ziraludowozudupadijad.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/97246431109.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135237b4978f---xilesobegudexufakakonog.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/60942691747.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/55402178891.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/55821565484.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/82959124738.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/buripajozaguzov.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/zilotesawunowogiwidopevad.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131abf1a7dde---45417371377.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/kezobefox.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140208f4a59e---35316616882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=memories+bring+back+song+download+apkPDF 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_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 11068 bytes
SHA-256: bbaf1f4bb78f524a5b8d98ab173db517675e5373c0e2186d6f36f433a9b839b0
font_01_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 18736 bytes
SHA-256: f85571ceaf5f268bb036719a71d304f28a44ad7d3c26c9d68e46d7d17f186a93