Malicious PDF — malware analysis report

Static analysis result for SHA-256 b200cb1e3036c876…

MALICIOUS

PDF

85.9 KB Created: 2021-07-02 20:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 39138bf3e291305ec81c4d6536d43449 SHA-1: 54019571c9d89ad26217e81072837531deb24851 SHA-256: b200cb1e3036c876fbfd93abe2f35443eaf9db69eb69139d8ed5ab094952bdb7
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites that host other PDFs. This suggests a multi-stage attack, likely involving phishing or malware distribution through these linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c4723e7276e9d4281d9476a1f0fe3dba/bikinurokasojuwutisa.pdf In PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97cc776bb5---23143271198.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/78g9b37l836qtnt3oq5u3ibmh5/pasesanifugul.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/lidetipufakesewojuviz.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090abed50e0d---15967275814.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/tobelezew.pdfIn PDF document text
    • http://wohingltd.com/userfiles/89502714921.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/jifetifepupukovegelawa.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160907159cd966---22103467608.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/22a2b84b7f31af2e9063cd2e34dc8427/kerurewofiv.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e74d1cfb0---92408947805.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160976fb7ee68b---86650739177.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/56745001c156952135d70de3409acb15/tanejubitikotelazegesa.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160763c7486e1c---77012555405.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fdc634f89---gijad.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f90e2ab663---nuxazalukizezotuputof.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/2hukluu0ljsu06ge0voae0g52t/mokogigapi.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/0uvsr4pjhc2c0pgdu88oia128a/83278736130.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/8300106624.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afff43b4886---85972439957.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c348b7d2417---18044196312.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/53751675223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+make+a+conversation+less+awkward+over+textPDF 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_off0000ed89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 10868 bytes
SHA-256: 02351c6f52c62e97d87ea2b41f00b4e225e5fef3bf03c0e8669edbbd994e71a9
font_01_sfnt_off000106a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBB 16856 bytes
SHA-256: 5e2ef6d34e8c063846f1ec5908d668d36b025d4adbdd285d29d007961c4b3a45

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