Malicious PDF — malware analysis report

Static analysis result for SHA-256 873eebc66f986ab1…

MALICIOUS

PDF

86.7 KB Created: 2021-08-24 20:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a58256bec9ab80af6ce8f03e5db36598 SHA-1: 09b88fff24fb808352ad5f3ceda0d8537ba9702f SHA-256: 873eebc66f986ab12fcb7de0f6b5edfd2745848b816669e64f6d2ebcc429d7c0
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and embedded links strongly suggest it is part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://deccanquest.com/konadnew/userfiles/file/69064795415.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/31dfe91e9b0f432956e6269c4cc7c549/nizefanekite.pdf
    • http://i-harmonics.com/upload/files/9803652777.pdf
    • http://erbamedica.org/userfiles/files/zedadiripezom.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608af56270312---42053048518.pdf
    • http://jarosi.hu/files/file/gugoraru.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/megekafun.pdf
    • http://www.cerel.eu/images/wyswig_images/file/26991711607.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/wezuronidavub.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a25e2dc6cc2a88efe3f663d2249bde2e/mitinitusamalefusul.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16077b92eb79f2---9782386976.pdf
    • https://hometeamcorp.com/images/usr/fumejomixixevogesud.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bee5fba4b49---34016966721.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b88639b07---99157842533.pdf
    • https://garraldaarquitectura.com/garralda_userfiles/files/kagoxifevogin.pdf
    • http://fsoa.cn/userfiles/file/tabarikerule.pdf
    • https://aradovan.com/userfiles/file/fejavuxodujomufekotu.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607730bf6fb76---10702975541.pdf
    • http://congtyvima.com/images/Download/kuwigoladubajogotosajiju.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096308686f13---5462855482.pdf
    • https://unibel.pl/pliki/upload/file/16546367999.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba787dca1bc---49700353139.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/vixivinememe.pdf
    • http://btfa.tw/upload/files/5249764701.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=i+have+done+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31a.bin
5c1490a3d22b5c728524958ce3efba9cb2b3554a55dc11d1dd0b59c6fba95a20
pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 16372 bytes
font_01_sfnt_off00011da6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 16792 bytes
font_02_sfnt_off000135bd.bin
4d9551262e4a4498c3996dd03424954796b5542076cd0fa55decba07ea69f391
pdf-font-stream PDF embedded font (sfnt) at offset 0x135BD 10300 bytes