Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8a2d172a6c45d0…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 08:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ecc898d560ceb185999d256318308a1 SHA-1: 9f098469c0334a74a34b2a0850b92d513f35f321 SHA-256: 6b8a2d172a6c45d01313508d2e756f92db6c0df62cc7af3c785d9a2a0afe0b54
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised CMS upload directories and disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fecirturizm.com/resimler/files/39020201907.pdf In PDF document text
    • http://lafenicealcamo.it/userfiles/files/jujalosolejudom.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/56918904448.pdfIn PDF document text
    • http://medi-sen.com/files/files/poniwuxodabu.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/75150532268.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090907484847.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/wamelijunaboxi.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/tuzujesisojuxepime.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/pewufupudoxos.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161339cb092b4b---20477639203.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/2521324461.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a148a5721---maxigabupujijugatudu.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/85429787655.pdfIn PDF document text
    • http://healthywithhart.com/res/file/44693024881.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/juwurufifawizodev.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/sasijeri.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/faxokol.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/fefuximozigininasezedowes.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/binumonekomeze.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/45946995965.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/rumexulogaworubifogederu.pdfIn PDF document text
    • http://e-sportis.com/images/upload/kobuvu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/11ae2848702581fabecef197942fe596/mitesobetizadapudin.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613482fb9b0b3---pujibafovukafaz.pdfIn PDF document text
    • http://digifast.cz/userfiles/demegifudizidekadukituko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+1+cyberspherePDF 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_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 18376 bytes
SHA-256: afc90cb3019cf5e357bec326bdc4924ecbd1651f06a756fe5f070aaae6f8c605
font_01_sfnt_off00011008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001281f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281F 10592 bytes
SHA-256: 52bd2e4d31dce8a674bc1145fae134aaf33169707924dfae7aea30cc42bc686d

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