Malicious PDF — malware analysis report

Static analysis result for SHA-256 1853b32b292b678c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 09:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8289055a9227da38abde127fcc3edf41 SHA-1: f1b15a32cc3002c861d03c068b3be8998c7253cf SHA-256: 1853b32b292b678cd81cd8e2f5f9d8b0e1eb4d5fc1e7b652e64e985b0ed13654
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nwatchonline.org/userfiles/file/74537325383.pdf In PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d58276e4dd---25236737469.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f3db127e6---minamamoxudimapuz.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859b04a5ee6---32915795395.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092da1d89491---pezinefodemavoledi.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/bakupadiwoturokugiwaratem.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8e0e44c5d004db08b71e01a99b34a1ec/96273179355.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/talilamujulevojumivanija.pdfIn PDF document text
    • http://change4best.ru/upload/file/muzanepakasejopaperedu.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/dufivabusewejozosemek.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/i1k31a2k0vkaeueh54dge9qoq9/zikavalamemana.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/fizonenizi.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095778a85062---49648642222.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/7198972344.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/39236514581.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/sanadesagovipunumo.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/tilajanenalivobagida.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e880235b4ac---30402686805.pdfIn PDF document text
    • https://infypos.cncmonitors.com/infyposcms/media/44709839658.pdfIn PDF document text
    • https://togeltop.net/contents//files/33635068246.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/t6bmeckgk1ovumei2669iu2c94/13992580386.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/loworu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=tensorflow+2.0+quick+start+guide+pdf+downloadPDF 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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 11492 bytes
SHA-256: 13cfcf8df668b3803c9467b8307948c1effc376c23b73fe18182d61449dcc4a0
font_01_sfnt_off0000fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11458 17736 bytes
SHA-256: eb019b2c9901d3fd51d74b5f9c3a1d65564d7af99d24b5fc73587b819b5932df

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