Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5518c8358fdd983…

MALICIOUS

PDF

89.5 KB Created: 2021-07-08 13:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cedbf68eaf193072748dc922c88a1c8c SHA-1: c05abe06c5f6fd8e3d8319a6182e1bbdbf196041 SHA-256: f5518c8358fdd983e7db4b387f5a79c19d4af09b0eb94c41f826187ee483241b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs and links to compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the presence of external links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crysiq.ru/uplcv?utm_term=ventricular+septal+defect+right+to+left+shunt PDF link annotation
    • https://jobtiara.com/files/files/mijorefakimusagakivewu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/df7443628207ef369ffd49c38d7f4316/dubonekufugeripukida.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/18282582091.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160854a45100d9---zubomigilefilol.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/kugamokusazozonumiku.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/jl1lr3m7nd0ji1amp83tkver6j/97390419825.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609890b82a02a---32514521135.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/zufomeguxasasugan.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb231e8b4---sekatezudaraponeme.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/jitibakuviz.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/mojovopuwubefik.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/62052523488.pdfIn PDF document text
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/73100794470.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/25a7b67022edc9e8f391bf16ccd5f8f3/bujafema.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/29378134887.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d62b0a4ed32---nikevetababoporaposonu.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/99649857050.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/12272499303.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/75893218306.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/95689379840.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/tumajosamodofewegevod.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/fpkda11u0oe8n5inf694qqdsn3/48842823185.pdfIn PDF document text
    • http://starsunited.at/upload/files/452933169.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/bidalowidezobidupa.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/mhckhkgdv04et9jpm1q0714uit/96232584314.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0dc7a61b0dac05a6bccd57866cfc0fe2/40384707619.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_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 17144 bytes
SHA-256: b0377dd6ef75f8981e54f4c1b066b21386d72287a0963e1f5afb8c142148e05b
font_01_sfnt_off00012705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12705 10968 bytes
SHA-256: eccc2cdf1e28a57a3104c1224fa8144abba3af02886d2831e1fc25cd14005fbb
font_02_sfnt_off0001403d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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