Malicious PDF — malware analysis report

Static analysis result for SHA-256 250bd8fca8d95140…

MALICIOUS

PDF

76.0 KB Created: 2021-08-28 06:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38bf0026a6c75d1f3379bfa234a9dda7 SHA-1: 5e15e6fbcfacf5159ffab0efb9e54c53f85951ac SHA-256: 250bd8fca8d9514051add7fae714b2b6fe01eac95f83773612a3bc68c56e75d9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating it contains links to algorithmically-generated URLs and points to compromised CMS upload storage. The PDF structure and numerous external links suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the overall pattern is consistent with a malicious document used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://auto-rujo.com/images-editor/file/63979064034.pdf In PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/f3a660ab1269d552e0b2d4adce456f93/71106334008.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/1316968065.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d9d13445a---luteteb.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/18097130148.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607448fe7718f---63986455158.pdfIn PDF document text
    • http://veitali.com/upload/files/fijabupeko.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/51551873193.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/gapumumimorefafobame.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/98fafb0deadb66e6c7077b13dae20679/86861331098.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945ffe24407---jibalabuponudevazabele.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/7915983710.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a6690a88b---50425363794.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/63170204492.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/4ab598c4dbdc09e2ebf8c421bb1258c5/67152099350.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3973320788---19983237298.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a4201d4ad9ab05baec4cff71ad208ce8/26810347690.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/zerota.pdfIn PDF document text
    • https://davaocarrental.com/images/file/vusejutaf.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/kemedokipeliwen.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e9762acb2---vimapuzogakufunovesokoguz.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/pefufemezizugaxeberajol.pdfIn PDF document text
    • http://vswet.ru/f/mubikedofepobutikaxigotid.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/99786606654.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16076c4fba801c---juzokilagajoxiginar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=interesting+world+factsPDF 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_off0000c6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 10688 bytes
SHA-256: becb9be39fe4a4a6b5898f5e62726205c6762e0c3160944ba67c31ac9730b117
font_02_sfnt_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 16212 bytes
SHA-256: 25f0e0455584e5014a2304afdf96b2cd80c71ba884cf760a17c1f95aec27ca54

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