Malicious PDF — malware analysis report

Static analysis result for SHA-256 5026c5a1ba1356e9…

MALICIOUS

PDF

84.5 KB Created: 2021-09-24 12:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 866cc17b76866bde403bcaa488e96ced SHA-1: 42dc89a9e0bf6acb504802e1f97643a554b2f63a SHA-256: 5026c5a1ba1356e93242a27a3d9d2e5ebd66e637c1c06fba84d315124a61fce9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, detecting it as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely intended to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://xn--p3t29jo1ed4o4xw.tw/upload/files/63525119183.pdf In PDF document text
    • http://agcslohian.com/userfiles/file/sozaj.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/duxalamixozotubanozisumaj.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614697db8534b---40354442999.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/wuxifawogutul.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/baduwisinexewisetubukas.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/vidawifukizuxokil.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/sadorojik.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/0a62530044c63489991eeb4beffbeea5/27524482322.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/dajer.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/91618757923.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///58449455658.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/zotidevisudodupaledo.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/7784346426.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/63422420919.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/fomizezinajokisebed.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/petotugelegakoxijosiso.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/59065305093.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/negutafimolo.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/pitoguweb.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146851aa9581---61586990039.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/59029553889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=o2+saturation+app+androidPDF 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_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 10452 bytes
SHA-256: a4985adb7d44113dd75760035f4fd6e723beacf0d60d7e489018469a8a041782
font_01_sfnt_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 19296 bytes
SHA-256: a64e8f3ff47539676bef2073fc6582d4ca36a74572f20f2024deae0081bea738
font_02_sfnt_off00012cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1