Malicious PDF — malware analysis report

Static analysis result for SHA-256 3147c0caca0f4987…

MALICIOUS

PDF

114.0 KB Created: 2021-09-08 18:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac8a9298df23a7dd5e42830a77bd8edc SHA-1: 4c29712f2342340d7afa5caeb7d946a09f12a0b4 SHA-256: 3147c0caca0f498705f94c151df2703a96b779101fc6532e4ddd5a7a03b8a35f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://etpatatietpatata.com/userfiles/files/15911623990.pdf In PDF document text
    • http://snap-drone.com/userfiles/file/55833610647.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/xakotugagevewevux.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/74638513251.pdfIn PDF document text
    • http://superbarter.sk/media/file/19209749721.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/78200893023.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/govolezizo.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/72499323740.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/76454125368.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/cgjb95m4gr2h5k00c3mbe3drb5/24904651380.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161343fa2793fa---watepememaxiworox.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gilinuwamizorudekugaz.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/zasiz.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/botepajalakuvosidirupikik.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/bajoru.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/rarenetevel.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/67820399091.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137088c522c5---46187822.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/32188454979.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/79075922411.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/bubezesanupetiwaleluw.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/sesopoponiminafobojozawaf.pdfIn PDF document text
    • http://ndt-ultratech.com/files/25094689298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=missional+hermeneutics+pdfPDF 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_off0001590a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1590A 18432 bytes
SHA-256: 5c2b9ce2746e3877a37904de27165fc11fde1f25fddad2b652861644ebc9b9ae
font_01_sfnt_off000188e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188E2 10976 bytes
SHA-256: 3c5f0021478f3c5c8e607071298164beabe2c43638be8bb8d2e9569580881828
font_02_sfnt_off0001a229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1