Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66d839cbf94a1b3…

MALICIOUS

PDF

67.8 KB Created: 2021-09-28 04:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dd3e5adf103a599115b3655d8aba1fb SHA-1: 0528c463b595912bb6f8cf8fe9bb95cc6e7be05c SHA-256: c66d839cbf94a1b334ed2d068b677e9d78c34d3e0a71d3c403fd3b4e4ec36381
184 Risk Score

Malware Insights

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

This PDF document is identified as a phishing lure due to its image-only nature and embedded links. The heuristics indicate it uses a screenshot as a lure, prompting users to click a link to download a file. Several URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier strongly support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614056d1d0e94---donemujefizuzaguwidulaku.pdf
    • https://trystsalonri.com/images/file/92599134601.pdf
    • http://easyhypermarket.com/userfiles/file/nizino.pdf
    • http://venkateshservices.com/uploads/papiguvepumoz.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/d92a10166b1f91f79a120c25b2ecebc0/xezofotutusafi.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/c4f5d81f2077f809c2fe84afd7d54f23/tivunilolunedu.pdf
    • https://elsa-daulte.com/ckfinder/userfiles/files/sakudirixegel.pdf
    • http://stapper.de/sites/default/files/userfilesfile/webox.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7d6d96f76---77170357625.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/49865796545.pdf
    • https://defrokatilai.lt/images/files/84454356807.pdf
    • https://hazeloyun.com/calisma2/files/uploads/62554453077.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/kalobifasobojonavakar.pdf
    • http://midospa.com/upload/files/katufabi.pdf
    • http://milwaukee.center/userfiles/file/xazivitivususewapok.pdf
    • http://saiprogetti.net/userfiles/files/bafepewazaxovesosivozop.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136f5366c1de---nilewuvoj.pdf
    • http://aviatechinform.ru/sadm_files/zuxawide.pdf
    • http://laureysnv.be/uploads/files/mubimajaxenokena.pdf
    • http://mosme.org/uploadfile/files/68717500520.pdf
    • http://dirpub.org/editor/ckfinder/userfiles/files/nazusababudamiresixejodo.pdf
    • http://arcstema.com/userfiles/files/47055605913.pdf
    • https://mrdak.cc/uploadfile/files/mipatod.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=now+you+see+me+2+full+movie+download
    • 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_off0000aec8.bin
7d4ab61ea95efee2d8b142995a5adc71d2293617df9f2cd0ec126174376c31a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC8 13788 bytes
font_01_sfnt_off0000d0d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D8 16792 bytes
font_02_sfnt_off0000e8ef.bin
02c8157aa349783afaa98f2f0ff9ece8618f066a7862b180acc822b54c0f0cf9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 10780 bytes