Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6e57cf2506709a…

MALICIOUS

PDF

81.6 KB Created: 2021-06-29 20:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fc876d8af1347788e97cfa947d41306f SHA-1: d0f3d250d409854d2579b6886882e8d9ee77ba71 SHA-256: 0b6e57cf2506709a866a4839d84b870390bde56d684488b33858636513716230
176 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous embedded URIs, many pointing to compromised WordPress sites or IP addresses, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further supporting a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8c64e6c05bcd12738737a756d0a51627/68999562914.pdf In PDF document text
    • https://1877painters.com/FCKeditor/file/suposizew.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/fixupafogemosuzomidegiw.pdfIn PDF document text
    • https://everestart.com/images/stories/file/gugolu.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/subunupujelumoxetawowize.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/918stph8uusnkc0406kla6q2b6/zefuxisobuka.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/eaf6698bf65f376f3a31482a96d93aa6/dosofipuwaretu.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/4tmrlpe6dn05cbdlnlhtk1f33o/riliwitiwod.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074635b634d0---7725021202.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-15/20210615014446988796.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/gisoxokexilejupaj.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/dudevajagodomawi.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/61265a02b2213dce9d9518059b5a89c1/riponagubax.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/nurisil.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a327ff8c919e4a20c2875fa8702574f9/vilosasazupaponapewo.pdfIn PDF document text
    • http://jaatkinson.com/userimages/15742681277.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607585109b211---27877297396.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/e469c836ff9f107299176a306abc7a03/pananu.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/tugotetusesixebonil.pdfPDF link annotation
    • http://rc-modeller.se/images/file///5652643200.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d58968c18d---lovesajuzujemelunor.pdfIn PDF document text
    • http://hkalc.com/userfiles/60545001192.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/vigixezaxafogovuvuwola.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabd1672b5c---65977755089.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/piwafopozineloxezos.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/251t7pk9uv6t8dujecpu88l6h2/kuxesevazilijuwologaniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ministry+of+communications+%26+information+technologyPDF 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_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 10524 bytes
SHA-256: 509d7fc1f65db515f9f38bb6ba2425caf0ea5bdc541892b76cfc0cbd53e3bc48
font_01_sfnt_off0000f3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 16780 bytes
SHA-256: bea92dfe729ee1dbc6e7d9b389323e9ac9a391d09aedfb067fa5a43098739666
font_02_sfnt_off00011f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1