Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5aced8fb3172af…

MALICIOUS

PDF

87.5 KB Created: 2021-07-09 14:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2c9009e7404f7a3d06faf7832c9f83a SHA-1: 5af5fb9bee685b889c317cbf64b72d73ea9203a1 SHA-256: ed5aced8fb3172af560932c6972eaab1163c5434b28eb0bfe58dfffb850953b8
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs users to execute commands, a common tactic for downloading and running further payloads. The presence of numerous links to potentially compromised WordPress upload directories and disposable hosting further supports a malicious phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://seabeachthailand.com/UserFiles/file/28289984488.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4d62d1de5---titewo.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bece9416a71---65291779624.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/82d80ed92e2570f4bd373957e7fcca73/gebiwelurabeselirolajep.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160729c78a7712---32016187275.pdf
    • https://kopari.hu/files/file/gigif.pdf
    • http://pincailight.com/zk/UploadFile/file/2021062215474873499.pdf
    • https://alutat.com/data/file/tirebumoj.pdf
    • http://www.look4job.gr/images/_user_na/file/21542647715.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a48ac745f---99092474090.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608331ba173d6---zaxuvar.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/9c1e8bfe11fbbb2d8a217e75ba54675a/ragomafuxuxibujumusix.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5787b3297---85122276024.pdf
    • http://re-view.online/fckFiles/file/xekiseledunoludoto.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608931b48fc12---61641798222.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086daf0128a7---kibarove.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/lv8d51oprne7u4p6jku1dstq23/guxufilove.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca55418feb5---bewezivabaropiwulo.pdf
    • https://brs.jo/userfiles/files/39032846584.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/7c9go7ncrpu2o4tkth4m8o61hc/29461925861.pdf
    • https://brod-plovdiv.com/images/46465469392.pdf
    • https://best-label.com/upload/files/50688079762.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ci6rrc5u5ueb8p9h83loov6135/jijafupanifevotevilot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=digital+image+processing+research+papers+pdf
    • 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_off0000f1ea.bin
1917600752c2c1dac35f3280b615909e2fc8292b3dffdd250f0cda5c180cfbe4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 16628 bytes
font_01_sfnt_off00011d2c.bin
00a1c9f7dfb5dfd533a93aa99e3136f87552fba6e8744a52fc94f68af3670b73
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2C 11068 bytes
font_02_sfnt_off00013682.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13682 16792 bytes