Malicious PDF — malware analysis report

Static analysis result for SHA-256 6704e0aa2cc6fb2d…

MALICIOUS

PDF

86.1 KB Created: 2021-06-30 05:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2204f6600c39750063bfe6b4d12b164e SHA-1: 8fbf51ac9ef98e77cfe449343173f5a168be346b SHA-256: 6704e0aa2cc6fb2d2f34c721be9b58088b6e7a06a32454e487fe8b037515e0f5
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be redirecting users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://bustotoronto.com/userfiles/file/11101994593.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7affd703b---lifod.pdf
    • http://www.520amis.com/upload/files/55874284624.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc72c899239---631923063.pdf
    • https://wfca-czech.cz/temp/userfiles/files/50261795969.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/50957609913.pdf
    • http://vizugy.hu/uploads/files/rozotosurezosafatatafugu.pdf
    • http://shuimotongyuan.com/userfiles/file/22949827795.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//21059909828.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/qoo4u9fr9n668jiqu29rmb2275/64201185462.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/42a203a7221b6b76949c90ca4fbc2a8b/88518376364.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ef25cc21---jobawurajunizosozo.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3dbf8937b---91354224323.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/5bhqg0ejlhrk8cko0ahoiu7lr8/60100623050.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/ddd6eeccbadb09588a37fdf9d25b6fb2/wimudalet.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096aa9e586cd---71958931438.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aded9860841---44998635362.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d953a31216---ranapewevowumezijenakalen.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/duetpuhmop1ecqqgg3b7db3e2n/zotibebusefubudijerimixud.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607156b03955a---76592882500.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/fd9f2f533cf6c2ad5cefd4330b991753/guvomatexabaz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=give+me+a+present
    • 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_off0000e605.bin
63196aad29c4a275f84118e40eeedd2b774ce1e4823831b648636925a26666e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 10352 bytes
font_01_sfnt_off0000fd6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 16792 bytes
font_02_sfnt_off00011580.bin
38bad6fd1d123a8e99b28e5efa6dad1ca4d5d2b785d6af70020cc9268706d9f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 23076 bytes