Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59c1bad9a1e6aa3…

MALICIOUS

PDF

135.4 KB Created: 2021-09-04 22:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aded166a97b0134ad1b0cf04fc6e8210 SHA-1: ce56f24dafd4b917d295b8816fd854f68e37e8b1 SHA-256: c59c1bad9a1e6aa359e98a01908c653740e1001d67f24756c41b5c14a1d828cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly indicate maliciousness. The PDF's structure and embedded links suggest it's designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/uq8d1qcd6kkgre6pq87pgp3mo1/53271710818.pdf In PDF document text
    • http://mudrberanova.cz/userfiles/file/27118150353.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3dbf2aa06---4572419826.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/nesilotefanowisan.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/geremejosili.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609441fb7b8c6---30185876133.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/wewelubotagifunoso.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/93111400777.pdfIn PDF document text
    • http://kalikraft.com/images/file/pagusepekifagowaso.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/70614940945.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210529142704_8dk0vz.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/549e2d1b4d3fd7f2039412011838b36c/dovukupisifewejepomubita.pdfIn PDF document text
    • http://sdds.be/userfiles/file/11644508492.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c933214e1---vegogene.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/96973246626.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/mavofa.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/87153030780.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/xebokigerikizewife.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/goparotawugukidizesagu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf569c64d---pogekusejaxuxofagoxa.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/049ed11601d99955f712e6f48cf8f12c/75483221310.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/fizigedupul.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/tutesivowave.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c593cbc22---91851506526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=coptic+language+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001884a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1884A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A05C 26060 bytes
SHA-256: 0315de8fe0e4a3870f1f812e9c7129b4437f1d14c27527d575fa4353cefe5492
font_02_sfnt_off0001e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E175 16140 bytes
SHA-256: 61a689b2040f4a35dbc6fa766f7c43776a64fdb5ab975a49d30241655d41e80a
font_03_sfnt_off0001f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6F7 10660 bytes
SHA-256: 2b752bfa7e7b3c952b940071e006e8889d2abeb90458f8c0c2d2a3252c3b8589