Malicious PDF — malware analysis report

Static analysis result for SHA-256 4733549b11ab727d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 18:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 806b64c6eef81cd85df0342c32e53c32 SHA-1: d46c4ecb9f35443564224abd840a32304497219d SHA-256: 4733549b11ab727d22b83f2180f404e24caae0fdaa499794fcc1a835d5e5c4be
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. The presence of external URI heuristics and link farm indicators supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.pethouse.es/ckfinder/userfiles/files/selifesipadoderigu.pdf In PDF document text
    • http://architettoangeli.it/userfiles/files/93422849723.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/togetipajepudawetuwef.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/mezopewed.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/38176714247.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/tl1v14bkv39hd627ofunqoq1og/xeruvezuwesugixodam.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/78978718800.pdfIn PDF document text
    • http://distributoram.com/files/file/xamurepigokilokaxopukin.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/radulogogakuxijujavubojuv.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/81277269000.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/sebapa.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/28169467059.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/07b3074e89be46809f76f267794e3a90/vewogo.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9ef2bd85a8254f3cf07b2069ee941a19/24467302357.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/dozidetasuxoja.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/niruleneturufidagusa.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/mafaxajusufotefamiwez.pdfIn PDF document text
    • http://fkhd.cz/data/img/xijazatem.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/pp7o0utvj63lmut8use462a6df/95104377512.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4bb86e5b1---dixerixozezatatipanimuziz.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/76638887744.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/vofusalosuvurov.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///38425149420.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/37292621701.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/260d6bb1f015bfe6c0d25b5923f07385/16126732134.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/63553807763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=solid+state+physics+book+by+ma+wahab+pdf+free+downloadPDF 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_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 18188 bytes
SHA-256: 5ca59c165cc0ed522b5678acc78e14ce7e74cf43cac92909a84159e5a386514c
font_02_sfnt_off00012339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12339 11392 bytes
SHA-256: 5559080315907dcf0e19a306149794cc1507fdd004e30ab0373de84f0e010eb1