Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a44f2ac4e7deb7f…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 12:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 81e712a629b23b978233e8cf27fbe062 SHA-1: 58fb3685ffe87f493b9c94a52ae25e5303747f7b SHA-256: 0a44f2ac4e7deb7fdf1b05f2fd8d0d83daad2e57e4ab03992fc06569b0187ff9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a42ab539edc99196645b8bd33348e0b/83302849330.pdf In PDF document text
    • http://1959blackshirts.com/clients/866684/File/86176316994.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/meguporajewiwugozemisun.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/35rf2bgg7esfr3htf14ua4di2k/soleba.pdfIn PDF document text
    • http://halanmilk.com/upload/files/33936662905.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/21016473434.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/qpg64o8s95akgtqc1egnhd3ccl/vixawukujubufubedomom.pdfIn PDF document text
    • https://hsse.cl/files/pesomenidadose.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fa1af101---muroguri.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/guvisesexubuzavumabid.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/mavanululubor.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/pitutujej.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/ropir.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/13543237831.pdfIn PDF document text
    • https://7gking.tw/upload/files/bozaroxifotavosu.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4c9c50571---78655342590.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/fopovakokizino.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210704_1D2121E5039880A6.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/29081600774.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/gopefowurife.pdfIn PDF document text
    • http://suttonoakfarms.com/clients/880813/File/pawavogigevitu.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/dugasowojezavumaw.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/14a925bbedd9ac9e13175547accd0de9/gemetanobosikokep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=railway+station+in+coorgPDF 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_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 17132 bytes
SHA-256: 79e4b3dbc8a2852de1de6b5358ac2e902b1f526c3ddbd00550b12028e797723a
font_01_sfnt_off000117c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 10516 bytes
SHA-256: ccc8a2f80fa4d7016707323f3732278a9a477dbe60d2596b7662004138bc1b66
font_02_sfnt_off00012ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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