Malicious PDF — malware analysis report

Static analysis result for SHA-256 887cafe28115a4d3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-22 17:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da17d90f5cb46d4ef628044bcb528ac9 SHA-1: 0451a3ff72c670ec28de54de6a2b2d7b347e57be SHA-256: 887cafe28115a4d3aa678dc54ca7d37bcb7669a96e42d45ffd5b7f3620bef737
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL findings strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/uplcv?utm_term=calendario+menstrual+app+android PDF link annotation
    • https://vitanov.rs/files/dereperujevigafelarisaxaj.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/69701106491.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/97587753615.pdfIn PDF document text
    • http://186086.com/upload/files/migosokozilowafafoda.pdfIn PDF document text
    • http://newmob.it/userfiles/files/89138783119.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147738617a4a---wokev.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/tulidavadopil.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/85803318165.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614031e0737e6---xofurulujot.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/xukipokajuromiz.pdfIn PDF document text
    • https://mfdesign.hu/files/file/42645997355.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/nanuvofunodedimunelaboka.pdfIn PDF document text
    • http://gaudi.tw/upload/files/fazozafelusasiwosazotawu.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/37278651772.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/beporapaxapedon.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/37235919637.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/17598792683.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/66342710a9ffeb41f36014ae7412c447/lataxisuk.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/43828044934.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/16538424612.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411005abe8c.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/98390460297.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/73822578792.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0fb4a8c2e---zejikuxitide.pdfIn PDF document text
    • 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_off0000d5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 17972 bytes
SHA-256: 8e349265fe3674da6310252f30f259fd82ac3ffb806eda8395c33687dcdb4fc9
font_01_sfnt_off00010494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 10684 bytes
SHA-256: a29c8b4e5eb2be60a6e715633dfd31a5b1544c915ec1fa15b390bd88cc9efe8f

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