Malicious PDF — malware analysis report

Static analysis result for SHA-256 d043cd63693f1d95…

MALICIOUS

PDF

88.1 KB Created: 2021-07-16 15:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 940e629724d2f8c489007a8a5e082207 SHA-1: fa7376c2b788bb1c4a6fe29689d00b64409cfee3 SHA-256: d043cd63693f1d956f5c653e119d5c60a08bda40662cd36d2f5d39ac188a3d98
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters further support the link farm and phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a217daec7c---42732416519.pdf In PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/dno305k7d7itqc1nu9f3ui0lrl/92519887126.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/d641922fe2320c9153d79e80f5dce015/27626128919.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b476452930f---suvunolixaxefeme.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a0ada675c18---69890233673.pdfIn PDF document text
    • http://temple.mo/userfiles/file/79066230639.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/63705899764.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa1f0e2883---jopezubiferovixu.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/gujavetaro.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/42723858714.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8669a2dce1---rafewipirufadok.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/58798388514.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/29809051194.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/68a6662b79a711d29ed114e34028cf86/gilemetupanagenologo.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/47494587095.pdfIn PDF document text
    • http://babamoleskine.com/files/file/nurevobasabef.pdfIn PDF document text
    • https://paperland.bg/uploads/file/72215377176.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b549323b21c---79396159265.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/34609739834.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/7e156608e4a0505faed6d9f8cbee63ff/fomedubeminurifetabiwidod.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee87140af---zudusin.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b4a5853c---48103871905.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9fc87b5c7---fimuzara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=english+grammar+handwritten+notes+for+competitive+exams+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 17028 bytes
SHA-256: 5cf8c28b61a45e6c715088fc6b5ebcddcdccfce87a18d075b3aa3a9825bd27bd
font_02_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 17472 bytes
SHA-256: 7d348177a2e7de4b496fcf3b90ddb5dd9b4d7eda6b4c4164994359749bd94a97
font_03_sfnt_off00013619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13619 11304 bytes
SHA-256: 0ec27a7cf1543112b213d402b53cb9af415aea24adec4b1f57b8b8508e0b4b16

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