Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb41ec9720fb5ab…

MALICIOUS

PDF

85.4 KB Created: 2021-07-16 03:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 02c0a23efa808be7df8901c1f7eecba8 SHA-1: 8fa8574fb2bd40eec7083db788be9fcc528d73dc SHA-256: bbb41ec9720fb5aba6bfe1c2f3c74e2794af5ee70dd6a2bbde0e24c7c273c1df
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://botosani.ro/img/uploads/file/85301246638.pdf In PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/l4olr1pfcer4okq6ti5l11bg2u/gulerul.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/pesajovosepadixutije.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/gurix.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/rutamenegolevekepak.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/tod0785ur0o3q6a0mk7ujmk6vb/rozirir.pdfIn PDF document text
    • http://ipublicity.cz/data/file/gazobedoripipeto.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/kixixu.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/duzelipim.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/zulowozatogaxifejaxep.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/pakapixewofo.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/d8mtn522v74megms9t8b1fgseq/legidojim.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906b85f1364---julokipax.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/b3jllo2updvq8b258odrfs793g/vavegom.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/kijetawex.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/27018566885.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06d6d7e6ea---60503743498.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c77aa155058---50755804022.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/81526449345.pdfIn PDF document text
    • http://imbirimbir.ru/files/56864362192.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/449ffccc3c2c1f8cd09ffb5d4a92806b/savabogozejupifezep.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/aa776dd21e96e109fbbc51484c8e088e/97227831454.pdfIn PDF document text
    • http://windhorst322.asuIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=introduction+to+cosmology+barbara+ryden+2nd+edition+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_off0000e865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 17196 bytes
SHA-256: 3603bcbf73e92b2f7c328859e63f222376aba4ed2f4c05970e9f6cc273c20cd3
font_01_sfnt_off0001158e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158E 11388 bytes
SHA-256: f8e659c234caaf5bff00b8e18b1c0107bd9842d65383cb6e7fdb122508e20064
font_02_sfnt_off00013012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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