Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee83f377a93d8a1…

MALICIOUS

PDF

86.1 KB Created: 2021-09-13 20:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ecc63308832bcfd3f622579e8cf9f46b SHA-1: 14f3df8d4b4e669c60419cf4056d3df62c6d15f1 SHA-256: 9ee83f377a93d8a18640dffd46068f744df0a18e405bf44b14ada3585da06eca
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, are part of a larger pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dierenwinkelindex.nl/images/uploads/58662478176.pdf In PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6dbd1f7a5---dojofewutesafejuje.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/10701812120.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/90562854904.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf9d13b8c---xalumed.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/jifin.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/26276884718.pdfIn PDF document text
    • https://naves.cz/res/file/datinunitisezi.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d56c77247e---83784754812.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/rimitebumupifutuvukisosam.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/12693734546.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/61086816495.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/46980226182.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/15836785023.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/3785626496.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161352074c7293---mulonilosuzebuzikujeto.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/gazigerevedafesipineguv.pdfIn PDF document text
    • https://armenia4d.com/contents/files/sutukizepet.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/pojigisunuxurul.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/37989117605.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8057caca---85484650077.pdfIn PDF document text
    • http://rhondachem.com/d/files/6764929874.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/sasamotilonogexewotuv.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/ronomaxakirel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ad+free+music+app+iphonePDF 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_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 10820 bytes
SHA-256: 9c19de7817c3c2842bb503b4cc48875da291b7de5d4cc438ad545f12209389ca
font_01_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 18208 bytes
SHA-256: ab3e8a0c06cf87fe20016a0d8303e0fa6a9e620c30a3294e2f0c42d9d1a5f35c
font_02_sfnt_off000132f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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