Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23453528fb4483b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-02 06:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e39fac9385dfb9f312e84f2644d4e2e8 SHA-1: 98a0cb6aa7e91e90d0ddbd57cd00b238feeec108 SHA-256: d23453528fb4483b3f7d0daf85c680c6e1cb3a241e863ad3033955216061e3fd
196 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of advance-fee scam lures, coupled with numerous links to compromised WordPress sites and disposable hosting, strongly suggests a phishing or fraud campaign. The document's structure and embedded links are designed to trick users into believing they are receiving a prize or parcel, leading them to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e411961d9d---gopexesoxuwalukusagevopi.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/81f9277b61718f0b1efe1b5ae45ce902/munokopulewolemakurikekuf.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607656faf27da---jesejexavafijoxopamu.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15286893c9---74292954755.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/juganedoguxu.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d7dcbdfe6---29950816680.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/0fea3428e9f7d63543c6d246dbbbfa4d/37408120604.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/v14j9jimq2nt81ips0mu9iivic/wiwupetumirisaf.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/10d78219dc3cdbcc560e5f433f251b05/nibukumoxinijoj.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/de966a20215563526797eefa0e094193/89477281330.pdf
    • http://aklond.com/UploadFilesfile///2021042823125288.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/550dd4f71b567b2cfc21d129ee1a85d3/daxubo.pdf
    • http://uceng.net/_UploadFile/Images/file/97143013546.pdf
    • http://sistersaviopublicschool.com/userfiles/file/wibuputifabenif.pdf
    • https://agrilaui.com/userfiles/file/60093701335.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pcos+brown+discharge
    • 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_off0000d2c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C0 16792 bytes
font_01_sfnt_off0000ead7.bin
7eb867f854da9493e91216969b334d81b35e9a501afb93d85dc2d7e2a7b0fe78
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 10732 bytes
font_02_sfnt_off0001034d.bin
1b5bae40aa1b4674ad84b066773fcf9bb9681c666703f78a01b5242218cb4989
pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 17696 bytes