Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e90210ad3e22b3…

MALICIOUS

PDF

78.4 KB Created: 2021-10-02 12:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 30550f8ac69e3b6b81cee23425428c57 SHA-1: 26901c9cf6b7a0bc3a152de9b7b82c80820bc2c7 SHA-256: 03e90210ad3e22b377771992e5995e6e9148908d88c6ef930aa65c2673de5252
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://focalthai.com/file_media/file_image/file/58583294865.pdf In PDF document text
    • https://digireg.sk/upload/64172820396.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/vuvelomegoxoxo.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/wisakepovabidugukapufin.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/33675645195.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/nujupebasojazo.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/jebonopesuxemem.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/69958918922.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161582201a2010---93688146346.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/puxupawe.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/rorugawuzakaje.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/mojutixexetezobu.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/60531726990.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614219b3a7543---wikeladixebivutokalazare.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/befefuba.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/84001563248.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/jebidate.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/52964625323.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/fb921e4741bd0b5a5e0a2b83a5569789/kinojuledewinek.pdfIn PDF document text
    • https://777mto.net/contents/files/kijadu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad15003c2b---40428642270.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/967b6f52bb2ba9d952b11ed8d8958f74/sufofebifofumupijiwisep.pdfIn PDF document text
    • https://kawanmto.com/contents/files/21873250860.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/dizubipuzifis.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/85bab036352c265864d6dc1fa4d7812a/zinewitizadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=planet+of+the+apes+memePDF 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_off0000c516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC516 21372 bytes
SHA-256: 55bd65599f015c4f50564058be782fae92e9c59515903e115efe16da2950ab1c
font_01_sfnt_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 10432 bytes
SHA-256: 9b62461517c4fc752800a9870325861fe0c42cdafdafbb6519f20e1f25e37d4d
font_02_sfnt_off00011404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1