Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d4a485d41806b7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 01:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f267972874208d72d957614e85e48025 SHA-1: 3e40e63cc098de8ab2cd7282611257c349dc387b SHA-256: 83d4a485d41806b746fb972193ba14e49b0161b8e92a8dd45231b6bcf0c61025
204 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. Heuristics indicate the document instructs users to disable security software, a common tactic for malware delivery. The presence of numerous external links, some pointing to compromised CMS uploads and others to potentially disposable hosting, suggests a link farm designed to lure users into downloading further malicious content, possibly related to the 'hitman absolution for android' search term found in one URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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 http://xn--365-pn7mwb654m2qn.com/ckupload/files/67621775256.pdf In PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/vitusobuxeno.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/nepupatiloropodixaju.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/53017252720.pdfIn PDF document text
    • https://kueapem.com/contents/files/48908634068.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/jtotcm3tcsf81l6c1k4p6vpfs2/nejaxazinoxekujusovuj.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/ffb4d35785897a783eaec13c95f37c0f/muwewuxovan.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/14893448209.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/72099077599.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/famezokuzedirewajorarebu.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/fidiferuwikutolemo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf921e40f---270532145.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/kapijoxi.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/tutiwefufikomiw.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392186b05f7---83423239506.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/xewol.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/bajijufufamefo.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/tavukodipejujuziv.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/3c229a30808e73003eea69e7ad15f215/dimonav.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/vifemone.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021917051235298.pdfIn PDF document text
    • http://abwessex.com/uploads/files/99108154625.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/gajaxabizizix.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/99951681981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=download+hitman+absolution+for+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_off0000dc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 10816 bytes
SHA-256: cc9fa1343b7dcc003174c94c75a25778f3b816d9b9b24779f3efc4f3161a780f
font_02_sfnt_off00010d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3F 18312 bytes
SHA-256: e651fe1cbc9712df4a0e00dde2133fe4eb00ed0dc5211db9f684003194f719d2

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