Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0278f960f18e8c8…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 06:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d973aea7b434a0d23844faec9e45a50 SHA-1: 795ab77a3c04fc16acaba2c0c9cc3691a5b3e8d1 SHA-256: a0278f960f18e8c8f17e419ad8d2d9c38e2c58f3fcf0e7c4aa4332d597314fa9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links, often associated with SEO poisoning or phishing campaigns. The presence of these links suggests the document's primary purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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://garglob.ru/uplcv?utm_term=fur+elise+music+sheet+pdf PDF link annotation
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16070d5d74ca38---39067675329.pdfIn PDF document text
    • http://capri.lt/userfiles/files/xulozufeke.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/joxafomadabixobupisoluno.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/kuwinidulajesuwid.pdfIn PDF document text
    • http://talleresjpg.es/img/file/54582519978.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/22426277075.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///renodaduxemukewozomut.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160badef5140b6---44452041838.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/zemumulugifuxomekeb.pdfIn PDF document text
    • http://immopolignano.lu/images/gumerux.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/81694578268.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a5ca1b2cf2ad79065a04900084ae4a8/67045719367.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/8eccb520d54000c3ccafd3efd9cce095/94630191508.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021082323071773499.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/wuxumovukoxeg.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/weginuramebetozofiw.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ae89cf784---xuvabojosijafotilev.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/62036718864.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/74366682476.pdfIn PDF document text
    • http://lagrupacio.cat/file/mesajojute.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/26952396095.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/d431b0fd0f9a5c798dcd8a2b5ba2b220/meretajojitejine.pdfIn PDF document text
    • https://majubesar.info/contents//files/60205020633.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/najid.pdfIn PDF document text
    • 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_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 10576 bytes
SHA-256: c15f27f1801516db0bf794d8c6779e0fdf4ff8eed7be79d59d12c210197376ae
font_01_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 17220 bytes
SHA-256: 6d50403e1719db9ddf0bfe2b206ccd9f04625a3118df09a778deb2b415782fff
font_02_sfnt_off00012476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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