Malicious PDF — malware analysis report

Static analysis result for SHA-256 6321ee616cae028c…

MALICIOUS

PDF

89.7 KB Created: 2021-09-01 09:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 435b72821141ee326c091e453ba3750e SHA-1: ec3e98415c4f89a9e10944c0692cad6ef0dd505c SHA-256: 6321ee616cae028c162532a52a7fe3c2235997b6f3962e32fb4d546881511a2d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external PDFs hosted on compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing to a link farm designed to distribute malicious content. No scripts were extracted, but the overall structure and heuristic firings are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://tucarrorentacar.co/ckfinder/userfiles/files/tewefasamovix.pdf In PDF document text
    • http://scsytech.com/upload/files/vawow.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/22983405506.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160890a10277a1---93092675903.pdfIn PDF document text
    • https://ibericadearmerias.com/file/35846725600.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f7cb51481---fokenozosokinozu.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/nosefake.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fee417c985---padaxalewoput.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/24551646175.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/13530506018.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/2792283444.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/8fnn37tp50btq2v8ld73unofl2/26256876644.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/41811676504.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/66f8032c1e22c7af98e20d26ebee9890/rajelunesexekiju.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609815d825d40---47379780967.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/728c12e18e9c7337f512160ff3289f85/jalepixavub.pdfIn PDF document text
    • http://humanlitech.com/files/files/rekejojajagoni.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/33eff40a8551d8429f874363e69b20c5/goxuz.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/23285018461.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/kilojifa.pdfIn PDF document text
    • https://medtek.vn/storage/file/zegob.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/25533055068.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/77191983497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=requirement+mail+formatPDF 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_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 10496 bytes
SHA-256: cf5317b0290bb68317bb8459b8b466b0f24fca95d9f28813f3c2173be3300445
font_01_sfnt_off00010f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9D 18712 bytes
SHA-256: 3666de7bfbc8bdce986f0b966c634ada0850cc84a3f9748f8f833a1e5468e68b
font_02_sfnt_off00014003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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