Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae34d21032b4de03…

MALICIOUS

PDF

77.3 KB Created: 2021-09-07 12:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4dc85f93c27ac82351859cb15d9f381 SHA-1: e96a09b408687815ef4c665f0bd6784db35686f5 SHA-256: ae34d21032b4de03b8970c68db94f7d855472e23f765d64842f9a30872f1175e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which are hosted on compromised CMS platforms or disposable domains, indicating a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the extensive link farm points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://meta-min.com/files/72470068981.pdf In PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/0ijbompkjvls8o14this48jie6/70222921186.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/nofov.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/99715017333.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/bokajififevavu.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/betimonelexijewiduxoj.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/ligufuwolifisalax.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/gapalokizuvefu.pdfIn PDF document text
    • https://istanajp.com/contents/files/88649538818.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/15191421611.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/83347741465.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e445fe7ee1---97341684298.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/cef3c7c017367e2e9cc11121428329d2/sofebovugorugoxepaludugi.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/durorunubudebizedikitu.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/redexipofosijotipunuvuz.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/13d21ac3b6697fb3f21ea5bea5997c42/83546122783.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/namatadagobegixaxemuju.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/oth1b76c8k4sogu0ioop5fn927/zusurolujewamasobobafab.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/noporoguwub.pdfIn PDF document text
    • https://tl-systems.hu/files/files/muzinu.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/69279826695.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/95496686253.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811c577c596---77210415309.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/jisedu.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/nuwumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sri+guru+granth+sahib+steek+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_off0000c833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 11020 bytes
SHA-256: 4bcf962c7a50604aa53b67dca1cb3dd00aa9d73b4a161577d0ebb626c192012b
font_02_sfnt_off0000f962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF962 17824 bytes
SHA-256: cefa3cd820db372115fc933292b610527b2d8ebd1b5d2a79b63ae1c6c53164d4

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