Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d31e8d269635ec0…

MALICIOUS

PDF

135.0 KB Created: 2021-09-06 04:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c53e3abfe1fe54d5621db5d7deb60c74 SHA-1: 6a21e8ba74f58c4bd80179fcc50a270dec141358 SHA-256: 6d31e8d269635ec0da1c82fc926d0274ca641d20491ffd254b549707e2d0ddb4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to evade gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://www.uflo.edu.ar/ckfinder/archivos/documentos/panebewisa.pdf In PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f049db9b64---xipikenavanit.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/vr5o1p1n7uf8s3lspqfcooinic/7145103873.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93666092978.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/60948adb5d7788704fb2d924bf84260b/kafadaxevojifofobugef.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/tokuribekedanof.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/61423822907.pdfIn PDF document text
    • https://bak.vn/upload/files/zakebuxadedidiro.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/pokepidos.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/kitabafeser.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/28acb8ac20a495ad661ad5bdb35d8ad0/nugalunorifobe.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/37219001228.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/30110101012.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/birodonejawow.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/32937021895.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/77301180789.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/foxeletufataderenum.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/9611636028dbe0200b46665b04f2b9cd/doresuw.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4ohfrqbf0kpgmk8c4u85kbjm9d/26537330274.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/xiwemobixopuxezifilobavin.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c6a8ed6e7---45673928800.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a44da2458---95202531471.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1e3b00e18d---21183670901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=chamberlain+liftmaster+professional+owners+manualPDF 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_off0001a749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A749 10980 bytes
SHA-256: 25f0696af558185bda9eaba87e8985ad297aff40d217fd84dee4b4207ed01eda
font_01_sfnt_off0001c068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C068 20372 bytes
SHA-256: 6a2b06f254ffe8ca0cf9175e00d8808e19a518173ac9cac72d2f2f3daf84fd54
font_02_sfnt_off0001f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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