Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adfaa9c2f515859…

MALICIOUS

PDF

77.3 KB Created: 2021-09-26 16:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 570b655738a13067f0d3b94c4a24f2c6 SHA-1: e081be7dc4aef4234fd9f0c26d4d055646631f11 SHA-256: 4adfaa9c2f515859aa910f07e1d3a760b673bdbd6e2314babe843bd81ce0045a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains numerous links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term=job+cv+maker+apk' in one URL strongly suggests a lure related to job applications or CVs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://sial.pl/galeria/file/80187902569.pdf In PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/vewiluzowopatulumozusij.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132bcadcdf6e---jogokumimoxaxurajolegi.pdfIn PDF document text
    • https://nasikampung.info/contents/files/18158092044.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/61264907135.pdfIn PDF document text
    • http://theponghop.com/upload/files/64614803630.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ehaitb88grpd5k5ht3qm9nn0d2/20482054998.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/rasokokumaxi.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/93892175437.pdfIn PDF document text
    • https://aspirans.com/files/file/zibef.pdfIn PDF document text
    • https://mklaassen.nl/images/file/41086789605.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/2021912548442060.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/39987829709.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/73d6b7f8786034e2520ab3be6ddcb414/10168267832.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/dodipitefelikamop.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/jamifixepodilijazifafu.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/wiwupadowixujazo.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/27485874294.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/86962545706.pdfIn PDF document text
    • http://ux-school.ru/files/files/mubusif.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/7043807309.pdfIn PDF document text
    • https://durimawar.com/contents/files/mavuvufoxebodovatatuzarap.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/sumitegupim.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/25852241485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=job+cv+maker+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_off0000c433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC433 20092 bytes
SHA-256: bac4d2601298a9055dbc77e105d68ed68f027e8ee3834e1e65eac6ccfd3748cb
font_01_sfnt_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 10316 bytes
SHA-256: b6bcd0b4d9486f01709455f3ec930b4f7de622064e0eb6bd9042094560caa3a4