Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a055730e59702f6…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 23:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb3d0da471706f36518883b3ad6cc2f1 SHA-1: 7fb6ecdd5545292a084af3fc701824435ac53aa3 SHA-256: 2a055730e59702f646ded41a63e4fa40ca869aa86200f1f59987cbd7ec324dae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://oniceh.ru/uplcv?utm_term=vector+canoe+capl+pdf PDF link annotation
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa65530bc8b---kovejapemaremisokudiw.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/dinufawuwexozosuzanovozu.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/99389189552.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/27981628539.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6babec629a---reduzadokazisagubeme.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb48b1e027c---wumifemufirelinez.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/girogidozuguz.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/9b5795e175f323ee832fcde7dca4cc9c/95242132327.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608acd081547d---tuxazanoj.pdfIn PDF document text
    • http://bettekingproductions.com/clients/874300/File/bivirifajofamufixiwilim.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608249d90904f---77001135482.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/93756971637.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/72338548671.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/73009706120.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/tewefasamovix.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/figakuvusesoz.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b04ec2b34db---76228960294.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/80957493299.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/56358723475.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/fusasedawukawobis.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/63cbe172b953c84e2665ba1b0f15e475/fuzogonuvarojufatomo.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/11757a8d606a6c38e99f32bdfd7bcee3/62806284352.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16086e759746cf---fugifajivare.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/98422008681.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/gabofalubom.pdfIn PDF document text
    • 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_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 18148 bytes
SHA-256: fde43858361c04adeb1d63fa7ad6e224d95089085cbbb63286dd6790b3072cf8
font_01_sfnt_off00010e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E51 10324 bytes
SHA-256: be7200ceb275d423a6d1b343fc48ece5f8eadbd3b17f17437f64a31e4d2d02b7
font_02_sfnt_off000125b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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