Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec613fd0de993bb…

MALICIOUS

PDF

102.3 KB Created: 2021-07-02 18:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a01852ad19e63f61a54f2a5de07748af SHA-1: 2f3caf56deefd5c42210b77c2b279e97df99341c SHA-256: 1ec613fd0de993bbd68224f7634c8178f00f7287bde4c7959af3376c2f5072d2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the ultimate destination. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/felomewusutupogujo.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf3d11bf7---mimixanepalorozojuxi.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/17d13550db6f2d1c304c00bece567376/kekemar.pdf
    • https://newtech-utm.pl/userfiles/file/92449622456.pdf
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/vogadefeguver.pdf
    • http://best-infosystems.com/userfiles/file/55797964.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd70f3766---63624272976.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07a7027e3---31979692384.pdf
    • https://ahha.az/userfiles/file/zuduxevomerit.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ekpa969diut3jfbjdbii2dqhs3/pigowarotolosarofiw.pdf
    • http://aftckwt.com/uploads/file/gerakedubenomufubivazuwa.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3e657918e8f275f3717d65f4c6babf35/dekalejaxosazuj.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a994198d4d---45124902452.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/lkj33mvv4lg16vlovapg5he3ri/78937390494.pdf
    • http://englandmatchshirts.com/assets/file/xemuginotudakade.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160841ca58821a---82416313980.pdf
    • https://laurallo.com/ckfinder/userfiles/files/zutudewikepavupofo.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/bolesejevikume.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5955238bf---gomarivukuwegadapeju.pdf
    • https://sinhadventure.com/uploads/file/45853449873.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/09jkl6eb9j7em5aqlq0civ0b75/ludexeburexemagu.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0918e7f1b---93538762024.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=visible+in+the+night+sky+tonight
    • 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_off00012d1b.bin
a1fbac667f5d9325d1a98f9c408db1ca2b8ff1b6958ddd79bc61b17dd21bde80
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 10440 bytes
font_01_sfnt_off000144c0.bin
65a96df8099aa1e2d957df182879b46adb0d4aba0f927f363867f0e7950abd51
pdf-font-stream PDF embedded font (sfnt) at offset 0x144C0 18084 bytes
font_02_sfnt_off0001743a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1743A 16792 bytes