Malicious PDF — malware analysis report

Static analysis result for SHA-256 83444f415892f7e1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 01:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2b71d88d5b774adbaf30f482e8c17556 SHA-1: 67060b9ebb96c94efbcadd7c7de86d1851120c87 SHA-256: 83444f415892f7e1eaeded5a5f6be12b4eb3da728370ceabb3bc297cc9bc71ef
164 Risk Score

Malware Insights

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

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to potentially compromised websites that host further PDF files, likely as part of a phishing or malware distribution scheme. The presence of numerous links on disposable or compromised hosting, coupled with a deceptive 'download' lure, strongly suggests a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mingyi-lock.com/data/file/userfiles/files/bifekuxetazanulajabat.pdf In PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/65418450052.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/10958154795.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/85663839970.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/vejobilo.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/39870040893.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613525f20a50e---45638516322.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/4c00a1054e526bb4d1c77ba7b628eec1/suxafupelovujunuwawu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/37812194315.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/117467940.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/99586345243.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/desisevuvapejojotuzi.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/68055776403.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136f62120fb6---9129009694.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/nivazali.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/vifawutur.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/262816425.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/28196863730.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/66510004428.pdfIn PDF document text
    • http://kccmaul.com/files/files/figigowu.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/sebolazadomumikofalinano.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/12461508053.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139931ed4f9f---37796124484.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/bugaburawezeb.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/55098343689.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f45d85f6d86932870b9ea8b7f0b357af/56774659281.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613265331c249---28193018871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+install+pes2012+on+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_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 20356 bytes
SHA-256: 590b1d7d8a0cd908a62794d108f63b8afba041181d279256aa185bdd86bdb852
font_01_sfnt_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 10756 bytes
SHA-256: 2260732c418190bf8a5c9317b99dc7dfc48a646f6d72ea56cac9598a52b159ad
font_02_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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