Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91d9ed1968161ea…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 00:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2fdd88392a63af7abde4257a3ef4b600 SHA-1: 391e03e4f24a23118c323e4343fc8629bfc269df SHA-256: b91d9ed1968161ea787fa74a50176736beb80456f98c6d5d32cd73c680e05e4f
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 9

  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=put+two+photos+together+app+android PDF link annotation
    • http://udokutscher.de/gfx/userfiles/files/40067002207.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/69894483066.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613925362c455---roxavawavagiwasim.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/40116355617.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/78928427563.pdfIn PDF document text
    • https://steammining.com/userfiles/file/wuturukukijapanitelujox.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/9635197354.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210907_052158.pdfPDF link annotation
    • http://kcemsp.org/upload/editor/file/53098459062.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303b0f0194a---ronutepesubi.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/watebibumojapagofof.pdfIn PDF document text
    • https://path.mn/userfiles/files/42733732344.pdfIn PDF document text
    • https://rotitelor.com/contents/files/55633013569.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/mivaxofosog.pdfIn PDF document text
    • http://saktigroup.in/uploads/keweta.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/peperef.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/26b991188d018853608f407b9594032c/11159871524.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/30f081ceea6793326ebec6f42b60550a/23215925188.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/90405810141.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/29392027260.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/20640642849.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/pepozitoruwitafijuko.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/tbks71pvvt58a13acapgu5kt33/32946496361.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613888af1eba8---xijosajirokof.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/75747031792.pdfIn PDF document text
    • https://maturana.cl/upload/file/pawepiketigetokewiwusijur.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/88187907535.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_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 10812 bytes
SHA-256: b62c3f4157db411153bf8529377c2f84fb9d2c8b9a854221a2e9c1174f7c146f
font_01_sfnt_off0000fef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF3 16528 bytes
SHA-256: 778ddc22e42adf4f1617c51de0912881c7a161b4d5dcbcc48f6325bdbaeaa9b1
font_02_sfnt_off00012991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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