Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5390e8feefbeba…

MALICIOUS

PDF

102.8 KB Created: 2021-07-27 10:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df860dd9b001ee276c8df698603d6883 SHA-1: fb3f1b1e62977b8095a585c690fac3acfa23ce8e SHA-256: 4b5390e8feefbeba4bb77654794cc549f8655324ce328b5cd3da90ba96956e6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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 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://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/bimudejo.pdf In PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/nh39j5gb6mfhu6dk6h07higb91/53839140411.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffc2f55f69---nuzuwika.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9ada7932fa40094eae5c27dc0ceaa69e/bedinuwiwofijofaferumowol.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc94135917---fuvamexonelewul.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/41853288837.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/fagada.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7ed75db83---jubodigosixitojesozu.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/e5491d74ba174bbb1e670404998b57b9/jazoriwubekuf.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-24/20210724031019599942.pdfIn PDF document text
    • https://componentcnc.hu/uploads/ckfinder/userfiles/files/2057895252.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/12911454765.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160deb9a1c02d9---89905447640.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adc10c4bb6e---46171608434.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608432fa4ddc3---90482026979.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/26812777830.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59764b490c---puwarujebosedofiwegekutag.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/758opk8lsojcofn6i2pp0fkeb6/watuvabolomakagajug.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/15126171488.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/14bd72eff282f29a92d8013047efccde/66857379650.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/58ef81c3d296c87eb810faf65b938f48/puwalirajob.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/6dm97okf26r2vijls1ouad7h97/22211484830.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/93990145095.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ced9bcb123---sijugusisaganukirobid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=short+comprehension+passages+for+grade+5+with+questions+and+answers+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_off00012e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2C 17100 bytes
SHA-256: 2ca472c7874f9a6882d58738ab5cf1b93502cb4dde314c70f75b25b65d2a2647
font_01_sfnt_off00015ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC1 11564 bytes
SHA-256: 4b71561ef032044722264ca0886e11cf6f1e322925ddfb5df57a85752f6b0a15
font_02_sfnt_off000175a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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