Malicious PDF — malware analysis report

Static analysis result for SHA-256 7026ff7e2d1d8c27…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 05:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef854563dd9e3ef4b68aa7e5036f1d75 SHA-1: 48c4fb016bb99c6d96eac54068c9c53d16cc6f53 SHA-256: 7026ff7e2d1d8c27169cae5ae35a2527e27ac11a72aa4f3d92d4c89d425a4809
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a large number of external links, many pointing to compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the sheer volume of suspicious URLs suggests a redirection chain designed to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/hmvvmks5gq5cdsdp2jghg0bk1k/75272164194.pdf In PDF document text
    • https://aimara-bg.com/userfiles/file/velewolegudolow.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/k4us1v0no4s3nud53aamhhuc70/tuvoboriwefotubigar.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d642d3518---gozipan.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16106d60a93452---34486836175.pdfPDF link annotation
    • http://amirafouad.com/uploaded_files/file/19164550697.pdfIn PDF document text
    • https://micsys.in/userfiles/file/bufebigubefogapupebizux.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31b6a8fb29---rowekeliranoga.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jh452igtpvgqsbos8c896sot31/negobadenosesuvaxu.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/28590247886.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/mematezepuvutijevakibebaw.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/dopeboporuzoludoz.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160834961a1443---24291018250.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/nafirevolow.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cb756fd1f---51227690224.pdfIn PDF document text
    • http://zuche0551.com/upload/file/2599006575.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b611cb293---xoxegivibutomafax.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f8e9e022c68b59f12f0bc74297017ffe/subuditapojewipokuliv.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/41594291003.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/g02jik7b7sv0nc72ctrsh0qb1f/91863223453.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/faxexenomabujazimaw.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb466d5064---zadejufuxifakisugapum.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/93438843786.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/fexaponajifuxosode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=teoria+burocr%C3%A1tica+da+administra%C3%A7%C3%A3o+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_off0000d6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 11580 bytes
SHA-256: 9187082bca67681062e0124512a6bbc4e5018ec60f5a98b0bae48f19f82ec002
font_02_sfnt_off00010920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 19088 bytes
SHA-256: 8d35205972ca43b8f58055a128621127124a46b01dd4d45e01eb18f5a566291a

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