Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabe90df07ff0b09…

MALICIOUS

PDF

88.8 KB Created: 2021-09-02 06:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3249606c8c67a2aee75c91d610b95f70 SHA-1: 17499eeeab36a5fad3cdabc30b5645938d725aca SHA-256: aabe90df07ff0b098985ee529f4ac905b643104eecfdaf2ee06293e4eccbbecc
216 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan. The heuristics indicate it contains a lure to enable macros or disable security software, a common tactic for malware droppers. The document also contains numerous links to external PDFs hosted on compromised websites, suggesting it may be part of a link farm used to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161290180867c2---kodurasegawagakuno.pdf In PDF document text
    • http://lamachine.nl/userfiles/file/95698891136.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/zetanarasez.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/rewotifeganujuvuparukede.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/fcda0700444f4f585c55928522dc01c7/11938055697.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/fetekumalowaxobubovewup.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ip72up0dughhi70dghp97afa07/92751217170.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8e6b4b580---61285675318.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210716111916766251rz8ds53bc6lr.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/53460752447.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bedbe8d76---fapawatubadamewoji.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/nuzogek.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/n0jur9qcbdid5qpvh7vla81r5u/53222035585.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105150835.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/jidugilolanutiwibudejuj.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5632788aa4eddb1b3891af2177eb7d18/vefuzomorugudizawu.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/lakitafukajafu.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/divulogalixofej.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/29717376360.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/zadukizodewojom.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/6f8a717b2ee1ff4b1891c399e718dc75/47116425383.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc032b2e6a---zuturezamidigofi.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/7207080928.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/159611e713a93d14431c5f877daab54e/tiwanibutivanuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=there+was+a+problem+sending+command+to+the+programPDF 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_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001093e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 18816 bytes
SHA-256: 41e3a6b29f6b543dd88d07678543f22f3cbd634d1a9135127f32deb7a009143b
font_02_sfnt_off000139a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A1 11152 bytes
SHA-256: fd2bcb0adf5c368d50c920c5e20c3a405494ab7626d6a3bf339764b6ad7c61d3

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