Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbef1bc528dc54cd…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 07:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a824142d43497b338a1cc8650462f267 SHA-1: 9c1082f90033562e688452e6d05f34e773df976d SHA-256: bbef1bc528dc54cd37a5a3cc54d7c1fcd79377b8093a834ee3a74e77529d1aa6
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document acting as a link farm, directing users to potentially compromised websites or IP addresses. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings suggests a tactic to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://idcla.net/upload/files/53106945764.pdf In PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/fogiketawifebividuxox.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/wurogorulob.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d075cfcfc8a---livemime.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/90698183189.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/1a9ab82b687f7235993cf339a754141f/vixal.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/67kirlsaq9j6s8mdijvqafonol/99863843020.pdfIn PDF document text
    • https://virker-ikke.dk/files/jisuvufugubuxaku.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/xaxujuzafoxakikejav.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/gerejuvepapapojotexaxu.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/sasago.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f320aa847---fozajifoxikuwidinanukobup.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/5jmodqlig3o6eaomkf8ir0qm0j/nejinukafa.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/0cc91c1a2bf44331d2550ce69900f398/26390237955.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/436v4k6u0136pmucrjhb6pi8b9/43186514912.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/46157725550.pdfPDF link annotation
    • http://deshdunya.com/blogimage/file/14926819179.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/82334138858.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c51b934b76d---mipumijozazevofalegegot.pdfIn PDF document text
    • https://duvanco.be/docs/files/91651483765.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/nuruxisogux.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/xubirogitobibuvorakina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=latitude+and+longitude+state+search+worksheet+answersPDF 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_off0000c4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 10884 bytes
SHA-256: 693e66014514827985013b616b6c10c10acc883f8d8b7c827d55cabefdb6cd54
font_02_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 16672 bytes
SHA-256: 02dbec8f861ebf31df2a4820219e5db97f391c7aee723d4a0234a4c01e8bb165

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