Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f2494aca4abfe2…

MALICIOUS

PDF

98.8 KB Created: 2021-10-19 23:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bcee7bdf1506b4d358d68c0a1aed559a SHA-1: 65660d6805a1256a70c4dd19d3c17ce80f0b409c SHA-256: 15f2494aca4abfe204a69cd6ebb9af680b1e749a7c9fb252c5ba0907836db27b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or distribution mechanism. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

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 http://prvugkh.ru/uploads/files/titosirufiwixugelefazubez.pdf In PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/zanivojewafokidisikov.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/ruzunuwelopu.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4b980994b1fe24d60302717d8e93ace5/wanabikegilekabidotoz.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/20742933291.pdfIn PDF document text
    • http://anpharma.net/upload/files/23972679583.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7f7f4c1e4fa3cfb2d9f4bf465aaed160/87890344356.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/vonadulenuzuxuj.pdfIn PDF document text
    • http://ertekeles.diakszempont.hu/userfiles/file/wevigegukojotepo.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/84832187059.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/31815598577.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/26695172534.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/dalusekojamafuga.pdfIn PDF document text
    • https://amgab.se/wp-content/plugins/formcraft/file-upload/server/content/files/1616c5d3436367---puzebatutupe.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/44318969846.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/60762743545.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/fatulip.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/47133526933.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/21374066374.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/tagoxaj.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/45186582647.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/sodiviw.pdfIn PDF document text
    • http://btfa.tw/upload/files/6248140293.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/7xhmvLXWVJc/uplcv?utm_term=how+do+i+unlock+my+weight+watchers+food+scalePDF 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_off000116e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E9 11308 bytes
SHA-256: 9e841bb368c1a52c777cf7bfd5756696bf64d5ee424304777233ff6872ac2dcf
font_01_sfnt_off0001311a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311A 20044 bytes
SHA-256: 37873fbd5bc9d261cb2750dd70bebbd3c33dcb5e1df5305853e7f8033de8c958
font_02_sfnt_off00016538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1