Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7e94ce54508ec5…

MALICIOUS

PDF

126.0 KB Created: 2021-09-04 11:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 796c86530953af29595dcf81bf47f9cc SHA-1: 1a16a48ed67d09de157806df506b192ce8ec9328 SHA-256: 4d7e94ce54508ec50e8c397d14419e870832afc76b28f21b753bf5c649a3b9ce
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd03f584fc---95421626522.pdf In PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/eb68462742c8edcd5d6a5af5bd666a34/zepabebipenirobulosupit.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/zefilifofe.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210705232920.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/6f1f6f8e265f40a7041a4d122d034b86/61425072880.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612827407ac9d---xesetem.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607197a687db3---716063261.pdfIn PDF document text
    • http://falls67.com/clients/50406/File/64314681877.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/77991390577.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/o7ojb1n1ganlftbeileebq9ul6/jamumenotefevetagam.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609413f5dbf6e---49593561952.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/varipiganalikuxovebokag.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5f140592d480229348df92d86759192c/gepomirawumevagumomulores.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/wojusesezufas.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/kavep.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/h0nq5acoq1cojh86o2g2tjfatf/jalaniketodoladuge.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/19804226614.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b290915b6c4eb2b5b76de00fbb325aa8/42282337668.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/8fh7bkcsdunf8lmgn2451tae74/82148284040.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/lokedexopewegewoloremo.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/binivekatelifeweroziri.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8680fb9c54f6db416c39af7ed32a36d9/2469481455.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/61859028822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=interpretacion+wisc+iv+manual+modernoPDF 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_off000183bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183BC 10876 bytes
SHA-256: 396f87e94a3d54726cc45dfdc73dcd81a58a88eb29b7fe824deb996c66a00e5f
font_01_sfnt_off00019ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4FF 19372 bytes
SHA-256: 1eeaef539820eba39b87e81bb8e320ce1f39087b92104bbaf6cf5cdb60d950a1