Malicious PDF — malware analysis report

Static analysis result for SHA-256 131515fdb1747ec2…

MALICIOUS

PDF

80.7 KB Created: 2021-08-22 00:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5ed594114338748baa6fed00a1968bf0 SHA-1: d80cdf2c829c5796bb83a2b40f3eb3069e69812d SHA-256: 131515fdb1747ec2f80841eab105b5d655dff458d0d326893ce819a631812085
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs that form a link farm, pointing to various domains, some of which are hosted on compromised CMS platforms. The presence of these links suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://chcial.ru/uplcv?utm_term=gapps+4.4+2 PDF link annotation
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/bukuduveke.pdfIn PDF document text
    • http://byecook.com/ckupload/files/mulekopisukizis.pdfIn PDF document text
    • https://totounited.com/contents//files/21450756719.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/bubit.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/27614b5013414bc8a8b7a1654065a5bd/matuvaxirokasuzokotivo.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/wokepiveponofugefewu.pdfIn PDF document text
    • http://africareview.in/userfiles/file/5241683397.pdfIn PDF document text
    • https://yodobashi-church.com/30526860927.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/podutejemipixi.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-4/20210504041352525931.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/fubixadujawexepemib.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/27404353456.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/bepifuzogumolitosafo.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/84713872185.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/2983206f11da08274f98bfd4ed35e90f/pulesadisagoj.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/lozolazadexoloxe.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/41522481779.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/42245820650.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/mijakovobetew.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f6a1d7f7f---73006803652.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/05697bff681610b75f1da5715518b40a/76103886598.pdfIn PDF document text
    • 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_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 9856 bytes
SHA-256: 05ed8fb82fdeb3c400398bfbf00a7c5ef649408c13c1c1e7740b055b1c52eb15
font_02_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 16896 bytes
SHA-256: 5ee5c41b938974ae2d29ae413a033cfdb734ece2a04409e9244646af09413b7e