Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b71131e3b114875…

MALICIOUS

PDF

97.4 KB Created: 2021-06-28 15:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9f1de597f199675e7245759e38f2bfba SHA-1: 796bb23e0b40a669d75b677ac59b046cac089fa9 SHA-256: 7b71131e3b1148751c9fb9914c89e7fb43621fe909f62c1f56af94810b89aec0
156 Risk Score

Malware Insights

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

The file was detected by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b7af31b26---risejinegowefuneluxetomi.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086a7d0ccd71---mimixozilalureg.pdfIn PDF document text
    • https://ka-base.no/images_content/file/lupavenepefuw.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/95522395470.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb55706c3---19025023258.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/o2e67rc9051vt351iihci1pt44/96923675433.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f71a904303---66163717426.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/59424121614.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6827059f3bb6c186de9eeb5c9a1802ee/fakulokakabapevoke.pdfIn PDF document text
    • http://haphadoor.com/upload/files/sawozileludu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66d7783c83---vogigize.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210607033023_7tpc8s.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fd59a14c30cbac321a0eea91bb2c924/41986910116.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5f751444ee7ad32806202b8084822ae/nalibepuxusadojoxijim.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/12490998050.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/zejipenoxugubumuvolamekux.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce105ee56d---37005650418.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/direrugabibezuwarevaduxo.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca236446bc6---87755901736.pdfIn PDF document text
    • http://jucal.es/images/file/wusexezinoxizanilosu.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/92859354758.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911114d558e---92690509025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=download+harry+potter+book+1PDF 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_off0001190a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190A 10716 bytes
SHA-256: cda4e8a20604fc744e2d907fc625b81955a4fec1c0e75d6c21fc41a9137d79f5
font_01_sfnt_off00013172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13172 17404 bytes
SHA-256: e1da7ca77d0be168667b6f1eb139fa40a502e63c8768896f3c5dc91a0a06a8bd
font_02_sfnt_off00015eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1