Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5354ef661d47fa…

MALICIOUS

PDF

87.9 KB Created: 2021-08-07 04:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 841d9700f29597291f539891ca7cb739 SHA-1: 2307f1844a2f5604db469e5c6dc00e19b5dbe214 SHA-256: cc5354ef661d47fa19dd582fe818ea987c83830ab8ad2aaadc08960965213ddf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including those on disposable hosting, suggests an attempt to obscure the true malicious destination or to engage in SEO manipulation for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://gpp300.fr/userfiles/file/sabufeludumowem.pdf
    • http://allamericannursing.com/userfiles/file/tanedokeropebajezur.pdf
    • http://petersonhigh.com/clients/33446/File/25684091287.pdf
    • https://hbfilm.ca/resimler/files/pomudub.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa2bf368a6---dukojipiwizoguvodim.pdf
    • http://ore-processing.ru/d/files/67491811494.pdf
    • http://fonnepal.org/userfiles/file/14511777329.pdf
    • https://arhometutor.com/userfiles/file/tejarabiwesufinijuwol.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a083d67bfb5---tavafudabadoruvijuxudapu.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2503e4e550a1565048a9f83b753c26a3/1197521758.pdf
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/56718428861.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/848928fd78a478cb3effbbcd35492755/vegamafo.pdf
    • http://maility.pl_adresuserfiles/file/jujadowibupojev.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723547f2bfd---fudovegefimurowuxewebe.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/1ee90177b8a4b3cd979864413221a419/69283189654.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee454010a---fusejatokit.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/g7e6rtptio1gupd86h9afpf7il/fasedesomugirawakesu.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/e73122545571d34a4d9c88c66979146f/darok.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/35054563283.pdf
    • http://gesundezellen.de/neu/userfiles/file/457997143.pdf
    • http://citygclub.com/ckupload/files/29097716943.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=resolucion+de+triangulos+rectangulos+ejemplos+resueltos
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee61.bin
23ed66dcf7753a5cda184d85e121d69e8a0211f5953ff12b7351222a82eef1b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 11132 bytes
font_01_sfnt_off00010818.bin
0d712bc087ab2016d4f7ddf78d2968c29492d2f7b50a40ff41e3ec9ae0c7bffc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 18068 bytes
font_02_sfnt_off0001361d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1361D 16792 bytes