Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca664c99a4a81d6c…

MALICIOUS

PDF

72.4 KB Created: 2021-09-29 02:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 579f821a37b935a44643a76b687b0116 SHA-1: 5d2a0c3f3932f1aae4ad06dd97fc668220b3b669 SHA-256: ca664c99a4a81d6c0ebaccc1881c530cdde0f4b219395f0178f3a67e8f61b5a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://sutipatika.hu/userfiles/files/13412579378.pdf In PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6de7938db3a3a7f05200bcfc3e641460/92539522193.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/d3va1a4qqffneecag2p2eh3mvv/66110902757.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/64223807782.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/tazisokib.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/saxopepaj.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135a7448dabe---fimozawerabovorujasorabo.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/84703806721.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1614c965cf32c3---wimubobukuzozejajoxuzaxeb.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/xolujivilodozenatarova.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/71057682237.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/diwotawogojoxinunige.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109060803023041.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/kotorinuxipuje.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453047d77c7---70624918596.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/fdb9b33f0afed30657bdfd6072a4d5c2/safubobemajusifikenubido.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/80482355857.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8799176846.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/14307389435.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/cd90fde4df4062f036dbd24295a59e5b/76602279303.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/i2udbsor11881t663ug6gn6gr6/89918912257.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/36027321029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=recupero+foto+da+cellulare+androidPDF 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_off0000b703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB703 17424 bytes
SHA-256: 3872d75704897e43bbdda4a6aff77369df9cd34b58c2cece14c61bb84850a140
font_01_sfnt_off0000e357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 10592 bytes
SHA-256: 506604947e92f9c5c2e2a415c16b7a8b00ec512ce7e2603ae896de0fde4b2198

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