Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b912d2643d807f…

MALICIOUS

PDF

82.8 KB Created: 2021-08-15 06:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c4e77dc7ca7e68913ef86dbd82a6845 SHA-1: 8d7fb2ba7914be0498f08d41d3110d4e47b9a627 SHA-256: 54b912d2643d807f590f685f6a6002a157d7bc9e27d953319712cedd78284ae4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. These links are likely intended to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://medvor.ru/uplcv?utm_term=how+to+calculate+the+nth+term+of+an+arithmetic+sequence PDF link annotation
    • https://weborder.cloud/userfiles/file///lufesisoninoxakerujiluw.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/c296a3301fde6ef00b882ba739513970/wetukiwegobikunakan.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/kerarawexixemejo.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/1382cb3b6a5fa9372398d7ffc3758e87/wuvafapimoludowidomasu.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/95000081324.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160e6cef3a9a1d---32035526085.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbac835509a---57660982971.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/88905132586.pdfIn PDF document text
    • http://jonme.net/ckupload/files/biluwagilasikemusu.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/sezuwuvumexu.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/37520395858.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/5572757220.pdfIn PDF document text
    • https://people11people.com/uploads/File/vipalubaweporejeni.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/ribagiluguveduniketaker.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/zunofurad.pdfIn PDF document text
    • http://temple.mo/userfiles/file/jagaje.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/334d470d815986d48f729ce19c6fbe6b/sukalanipiwakimosi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kiqp1mkt4lu24osglnd49qeejf/43430885197.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/34731322592.pdfIn PDF document text
    • http://internationalbeautypageants.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/62539759556.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/subuxifuxos.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d8047341---nawixugonifedewok.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/32145595841.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5103c1ba04a4f5f332a83bc1af7bf434/61873415512.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/denopimipibiv.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/ea32f136e408e1926a9b30b868d7e0fe/wigozijadez.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_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 17456 bytes
SHA-256: 9a86ca6e93221f8a048c0c22701f4d54fecfc846287a985c5305e416455914a5
font_01_sfnt_off00010ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FE 10924 bytes
SHA-256: 763dda96e3014924d435142f3d42f402bf8486da7ebf98e444a1fc5737e63546

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