Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b6edd647b59cc5…

MALICIOUS

PDF

100.0 KB Created: 2021-08-13 14:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 912cda8613a11314629298817cbb969e SHA-1: 3a7a62d908cefaacc5513f6254b0b15515bf60c5 SHA-256: c6b6edd647b59cc5f2e7c12d1db69106970593f7718c65dabf9a2ec45c9d205a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/7f09518dbee04ffc197702871e8e23ae/65859785109.pdf In PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd94d3139---mizaka.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e57f634c9---tusopiwijodobatag.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/25984974730.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6cd728296---zumenavevipogipakinut.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e1d5e80275e0ef133ade423819b57e3c/77007747770.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/45840328205.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/20804596800.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/q0bpsqlm8us9hg5gts08p85t6m/70421395861.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/netizekerivatosodusi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1385db25a---38584662458.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075f676dc6b0---88866415133.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f204e4cff8---45999682954.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611593891838b---12678419538.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/be06932f9b320b634422d27ea6fedd20/wofut.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/18vpvcktf4slbldedom8tn6kl3/76030615875.pdfIn PDF document text
    • http://come2menorca.com/images/file/25052567988.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/46635448159.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/nolevisaruju.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a5006be5a7d---famezataxitofavi.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0d4edfb22---nupibepetovuzezopezudadum.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f2dc15122---57181763181.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/samikotawewogoxeb.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7dbc33da7ad97242043d87c3f9c14cee/migowexi.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/20891780781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=wow+healbot+settingsPDF 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_off000123aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AA 10504 bytes
SHA-256: 078dd1c0ad5511b0215531550cc7c4f1d2767c822e0f0c6e63061e9408da965b
font_01_sfnt_off00013b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A4 16848 bytes
SHA-256: 6ab2753a720e94cb3aea2f09578dcaec00056ad88d19ed95ea38c59327307ab9

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