Malicious PDF — malware analysis report

Static analysis result for SHA-256 977e01bb76e7c18a…

MALICIOUS

PDF

94.9 KB Created: 2021-09-06 04:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e7df0232dc65366161fd1069ad765026 SHA-1: 26f7c4281481169ad9e8925de09262d9f2188d49 SHA-256: 977e01bb76e7c18a7c2fa4599eeb1f24b6044a91ab93314c3ff76e6d8654674e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of these links indicates an attempt to redirect the user to malicious content, likely exploiting a PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://drafthe.ru/uplcv?utm_term=electron+configuration+level+2+worksheet+answers PDF link annotation
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/05d956a90cbbbbb72ea5098c9b12c1b0/26311531067.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/doxijasubobedegeda.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b8412f4700118c97f9f3fbbc19d879f5/43764070390.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/bokamep.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/69df287e0766a69aa6e98e51fd3a8627/nuzukanamexuxejego.pdfIn PDF document text
    • http://chikatere.com/Upload/files/lesetinuxenunonezaporowib.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fbed13dff99---tinekonevekamodoxe.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/mamaxarafidabuzigalosif.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085d136b4136---bozotup.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/xugowikovofaju.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f16f73d8a3---51584816776.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/56q1jrcns3hd9guq01bl6hah0o/73734311799.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/virr3r6faq5sjejhm26dqap9vd/38190706181.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/uii780k7iuesatjcfavqdgd791/25947363529.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/wolida.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609825da4ec1e---gafuwekanidu.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/43397634644.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/53450795142.pdfIn PDF document text
    • http://fkhd.cz/data/img/32771971375.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/jamuroxawaxawe.pdfIn PDF document text
    • https://noddy.nu/images/file/jafomunadu.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/89172981402.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160852f04543e3---70755481109.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/42238596731.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607337768ea12---megixakikavo.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_off00010d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D42 18340 bytes
SHA-256: 7ab3cd19da942ea16cd488af1c611e2264d1cdd969aeb16f3258e8fe9c8187ff
font_01_sfnt_off00013b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9D 11060 bytes
SHA-256: 85848e31493dab5989d9312d7cbb25872e9fce0bc8a788f5773ff075975e131a
font_02_sfnt_off0001557b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1557B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1