Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a73fa1fbc910878…

MALICIOUS

PDF

116.8 KB Created: 2021-08-20 15:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 43625242520d7dab481d1169475c6b3e SHA-1: cc213ae690f31c2ff7bed7a7fe4c4f24c8740f1d SHA-256: 7a73fa1fbc910878d21c01fc2e96e35bcd8d00e55b8b6461ae1004aae41fd575
216 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to potentially malicious domains and IP addresses, as indicated by heuristics like PDF_RANDOM_URL_LINK and PDF_URI_IP_LITERAL. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive link farm on disposable and compromised hosting points to a lure-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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 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 http://namngonviet.vn/user-/files/lujulumaxa.pdf In PDF document text
    • https://aokman-drive.com/d/files/527146226.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/5d97snp0aem7tjt430bjincgi0/pigudenu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/938755ff9513e64926650f504d481ceb/defanavatifugobedubugiba.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/47994283314.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2ca5c36970---wakirenilopibegalebez.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/483cd286bbab8e7d32c5487491c527fc/tesafiwenabukafulixenagek.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/11097282884.pdfIn PDF document text
    • http://chpcentre.com/files/file/minukebezepojupuwon.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/59891775913.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/80741947937.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/towubizibutogosukus.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/59511733839.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f15c0369c4---rodepejef.pdfPDF link annotation
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd6a5be16---xitidibijido.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d42682c83---81701708574.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47801401f5---97787257509.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d2d73c5b---6783957892.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e243340393---menokajusirejegixo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160991ec83d434---83630982482.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16104598d092f0---zexosanafutozutijuzab.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/ziboxezezamoxo.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/da85af8c0bede8f8ff300a05f4f59a08/41286838239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=why+is+my+yootech+wireless+charger+blinkingPDF 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_off0001663d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1663D 17284 bytes
SHA-256: dd206d55970a42b45bbdb1a5999bfc58f5c1f122d5aac3b6852444fea285f59e
font_01_sfnt_off000192f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ab0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB0F 11104 bytes
SHA-256: 709df3775dc45e636032100214d9eb6afeecc38f10b53ecde35e22c06c8bf9af

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