Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f828e35ecbd7e3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 05:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 44e9532f83e800cf10d237f1b8b4e01b SHA-1: d7afbae84c32e592459e6c860d85803418b01064 SHA-256: 92f828e35ecbd7e30928199d4647fce0fdc215e339d353c27fc5e86f0ba049b6
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites and disposable domains, forming a link farm. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The embedded JavaScript and link farm structure indicate an attempt to redirect the user to a malicious resource, likely for phishing or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://galettedesrois.eu/userfiles/file/zujadiba.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1d7192dd2---boparufujid.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/nugenagepozizurupo.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc7c313022---87937043950.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/nefubopal.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/regep.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/gojovege.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/difapevo.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/67579069071.pdfIn PDF document text
    • https://superpart.com/files/80298779962.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/xiwakagebejexu.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/35924058337.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/72032364111.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/61778680147.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344116054f5---tepevinubiluwevawedegofog.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161441673745b9---mozovubawu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/wiloz.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/movamon.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/815408780.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/3921034617.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/65147249345.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/tibopekobib.pdfIn PDF document text
    • http://hanauhrova.cz/files/76872011691.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/70019178784.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/61812492440.pdfIn PDF document text
    • http://neuroxl.com/images/file/gitadotezuwaxilebalek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=properties+of+rubberPDF 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_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 17536 bytes
SHA-256: 65477abab9a56be2c3ee86f559be113123c1da2a2db0d6fdacc3b3cd224a3b93
font_01_sfnt_off00011337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4E 10280 bytes
SHA-256: 4a9adfb49bec84f1c62d1e347659220f47d1731929143d9994a6ad97f9d46d1d

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