Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc0b7ceff7f0f51…

MALICIOUS

PDF

94.5 KB Created: 2021-08-17 07:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 49b5083dfa721a2c2588ad81fb57b467 SHA-1: 9d65a46202e3f6bc48be0fdcdd0188fe1698c49b SHA-256: 8bc0b7ceff7f0f513d3d08d43df4606a2755704659fee094d10cd5a4d7351161
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt at phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://augustaelectricalwork.com/editorData/file/reramevejog.pdf In PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4f1f17f0edbddc43abd3e24b524f840e/32300120642.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160780eaba4ed5---79250242506.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be23f7ac44d---85033597819.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/nivewivokatelixuzaza.pdfIn PDF document text
    • http://kingnature.ru/files/files/26790995684.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607830b55f766---65659099890.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/sosifiwotujifimavotor.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/rgp5c9i9ck0g5b5h89ikfmbhvj/pagopexapenepe.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c75dcd8d9a2138cf226f15b985cfd4c6/74809193488.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/7d027b7fe8f45a2e46317e9d15186007/52853021373.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a709b150b82---34211887518.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210623204759.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/78601505330.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e148bf39a222e5abba3c14075c711118/36675573092.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/82628336475.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944bee86074---jagitugi.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/9284097505.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b7be0e8d---7950613225.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/td9tbs1f9ng8mjaoou0cj9n5gv/digivulotiletivanararukit.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/e101fa76bade4e782bd4bc53f8bdcb6b/vawirosijilijukazunivesus.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823e0e094f7---febotutokanixasewukodofe.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/8itrbkrr9tj67cjc9a88r2vkuu/83800525208.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/0rmtqp4paft0f5i1hgqmuehv33/ganetivolokopato.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/t16fin89hbgmigp7a5utubuhf5/dojofusunipaminuzukasidov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=can+you+eat+scallops+on+hcg+phase+2PDF 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_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 10824 bytes
SHA-256: c64f1e38051826c73676025376ce88e65196db087ea69eb412e8824b31f44b60
font_01_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 17052 bytes
SHA-256: 7a57cf25657e1dae3de157b7ead1248c1f6bbed4c7b6dc6c7bc9925be4cc4abf
font_02_sfnt_off000152ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1