Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3c5d7ce63a2c8d…

MALICIOUS

PDF

91.1 KB Created: 2021-07-14 05:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b2de3230834cc8e25b4b4289cf3e504 SHA-1: 80931bcf5016761f0471deaaf491470bdefa7cb0 SHA-256: 7b3c5d7ce63a2c8d09f43e4adf50867ec37c176f7d38e42b61189ee2803d9aae
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDF files hosted on compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to an attempt to obscure the true destination or leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • 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://smit-electronic.hr/upload/datoteke/zivebumi.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8o67i3uml1jmblam60jrhjhh46/subokawunew.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/wisiluvewexojevogotudowam.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5995b8e77c---37433705368.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d68b966f308338e860263513ca714828/jebowep.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/8199181634.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/mazuwami.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/80228300855.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00c51d3f65---52045621175.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/bebevugofijoza.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/fe6b9a0ba4bb6205cab5db934cddce2f/11496567154.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/gogibusus.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4cfb7dfebca91b8181cfa8674c661e1/pifapew.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/55340157600.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/vokinudasugu.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/4650104526.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/66764591364.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ca2bd510---15273855772.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4af8a00726---ralikamogegazesevanugubo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd932310c---45031943773.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/3f629312d1a7b9c718b0890f5235452e/vofijixotodubu.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/97645244765.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/77598062935.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/48857179954.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f99ba6c6557af6b55d2c604ab41a9e7/71127516960.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/29919748843.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lo1q9ju8iavn6qjbl0ktabk3rl/gojuvezaguvobam.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/4ffe1a2962420339c31b69e285f59e04/wuxiloxafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=intelligent+systems+book+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_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001172e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172E 10876 bytes
SHA-256: b3f05d0f19b07d86c5a213bf4f74f9bb676a66f15d9df218203f0245f59eadd8
font_02_sfnt_off00012fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD6 18512 bytes
SHA-256: 4570e395605297d1dab98ff2236edea5ec1a5b811e046e98ed8ec1e3699a4eaa

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