Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd38f603e7fc355…

MALICIOUS

PDF

96.1 KB Created: 2021-09-21 07:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8be24ee6051e1b922966bd53b73a47b SHA-1: 1d9ea3295490bee203aa3862cab8438f744a6420 SHA-256: bcd38f603e7fc35584cf45505176b08b4aea39275f262957ebe091b652c9be71
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous URLs pointing to compromised websites and link farms, indicating a phishing or malware distribution scheme. The PDF structure and embedded links suggest it's used as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://huntic.ru/uplcv?utm_term=far+from+the+tree+andrew+solomon+pdf PDF link annotation
    • http://valencia.thepokeluau.com/uploads/files/zirof.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/42471480553.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483849befbb---dalegopigi.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/kikujuledutiviguke.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/87469165514.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/96058033249.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/64906027760.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/darawelenipinezazar.pdfIn PDF document text
    • https://matrixx.lu/images/10140652441.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/xukovemufinexanezele.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/13634747910.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/79753160722.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/tepilakizovakix.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/hi3aff4khbu94kpb6ng266knq3/15199102874.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/57090581060.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/donovusitamutowo.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/96000394192.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109012209172695.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/58443045329.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/winotojilumoxesenuzo.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/60587001147.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/nimijefoz.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/69281568174.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa5a4b5124---37454219708.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_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 19484 bytes
SHA-256: 4ca5c905ce5fc2e9e4e6a269aa9ceaba66e7e69454323dc417ff1bd47f1835c6
font_01_sfnt_off000141d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E7 10732 bytes
SHA-256: de4ba43401ed7db90b9695a78029d606dc10e913454ee94e4ba819526ba1b1b8