Malicious PDF — malware analysis report

Static analysis result for SHA-256 534804da71a84422…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 09:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b09b5c263cb5b5629c4d3f8941420398 SHA-1: cdb62e0282ffd39db9c876366be223ea9d73a261 SHA-256: 534804da71a844225269e40824d084b5c29dbe60dc11fe6783874aa50bc984e4
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URIs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://veraschwemmle.de/fckdata/file/dilafalimiguruzizosafa.pdf In PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/xefuwexoloxulavarukugef.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/bilunukige.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/38854470946.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/8941e6be3edf09dc46cfaa3224e33675/12143405955.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/xulinosebonova.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/45787499436.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eba72cbdf7---90347519363.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/kosez.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4b3ed8a2---dedifa.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1f93005bb298f4fe0411b61fcb636600/selilabexenaborasesajinab.pdfIn PDF document text
    • http://www.520amis.com/upload/files/66565552953.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec0563f06---fokidebeduwiditevunojuv.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/xazosobitam.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/98720255088.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/logegepavedamovukow.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/rujelodawezazav.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878cd0527da---porojupokeguzedas.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa802728e---vomegavukazoxafokumubejer.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/rekenezuwazoxa.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/4538103936.pdfPDF link annotation
    • http://thuephotocopytaihanoi.com/upload/files/34378274616.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/hhbk4ta5u4r20t2fl6u63ejbfo/xirevalugexagikidexaxer.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/jomusoginupisolobote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=kernel+based+operating+system+pdfPDF 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_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 18420 bytes
SHA-256: f1bf908ea0da3c7bbaeb1080885070314ac1fa272dc29315bcdda9caa7be1f55
font_01_sfnt_off0001134b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B62 11084 bytes
SHA-256: 585dc20f8c179669a0284e254704e00bbda928c18eb540043dc4c832a9d89daa

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