Malicious PDF — malware analysis report

Static analysis result for SHA-256 a275b02dfc4c0501…

MALICIOUS

PDF

84.3 KB Created: 2021-09-11 17:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9e5eb1952f7fb55985993c09dbc06b7c SHA-1: 03cf5d70193c039ce41bbb119c4963d4e2b324a0 SHA-256: a275b02dfc4c0501eddd3b700f6348db733f6dc62540ee9a54175515d15ef7d7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to disposable hosting or compromised WordPress sites, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm is designed to lure users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.vpn-solutions.com.pe/ckfinder/userfiles/files/nurezusuwofozafikivulak.pdf In PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/katevowu.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/18688734600.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/2680745176.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///89648322172.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/16251263397.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/xebudisulorurusaxol.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210902131143124.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/28461822441.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6ac79926---xeluzipafapamadov.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/dirotizawizexiwa.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/28090613189.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/69665438790.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/gidegoxotajobukexixasuk.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/pabupowiwikewu.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/welivekawafabelojiso.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/174c1850c51b0c0399167762a270a23e/98832867392.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/sukibovafepojeme.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9ffc9aee9---18114467348.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-4/20210904130919373420.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/gelop.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/32961805881.pdfIn PDF document text
    • http://abworder.com/uploads/files/53582432643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+phone+screen+timePDF 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_off0000e51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 18292 bytes
SHA-256: a698cdb2b48d057583bad53db1f21c2ee557ed94834785a3bc367bda762b9134
font_02_sfnt_off00012c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3D 10552 bytes
SHA-256: a99fadae14c8f88b209613ccedb5873b595ed32cea7e6cfb049bf0e728cd5808