Malicious PDF — malware analysis report

Static analysis result for SHA-256 963b7d4f310b1e60…

MALICIOUS

PDF

87.7 KB Created: 2021-09-19 11:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd1693d7ba50f8ed14436655bc0c5462 SHA-1: 061c1f380246d2648145664330d58ab0dada0e5b SHA-256: 963b7d4f310b1e600c3a9ad39f7052a0acd45b73376bd3affe43575ee42e13ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm with multiple URLs hosted on various domains, some of which appear to be compromised. The heuristic 'SE_URGENCY_LURE' suggests the document attempts to create a false sense of urgency to prompt user interaction with the embedded links. While no scripts were explicitly extracted, the nature of the links and the detection suggests it's likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://geofer.eu/userfiles/files/76590757559.pdf In PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/kebaf.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7ntg6s9tuuu8n444s6vc7at830/kikuwevepuzidefewi.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/sitirumadijop.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/zulugezomuk.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/kovexipejinezin.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/luvomer.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/jizowiniludorobefidexunew.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210907_661FCA87395C3FF0.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/moxaruridafuzib.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/mifurufuw.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/4064446965.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/xuzagepazupi.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/vefeto.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/34146943733.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/wazivaxelulapumojigupiro.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/90050826872.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/mogenerar.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0630a2b9ecb306a7df3d73066a45c8ee/15966788286.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/bb0428d564b08031455c57221c83029a/digej.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/nimuwexituxovifa.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/xatuxixibiwijafagoxoti.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4249b199c---13802922507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=brief+answers+to+the+big+questions+pdfPDF 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_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 11256 bytes
SHA-256: 2aaece28f783e6d2f8cc358f61426755340c74ef7f4813c91e5463c191b933ec
font_01_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 18196 bytes
SHA-256: be6f527aaeef4a085e1a7e6aa144acd2f7312872f1c826b72888a4bfee038d91
font_02_sfnt_off000138dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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