Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0990cb7db068207…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 21:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb5aaaa8dbe3bebb2f8a87b571c43258 SHA-1: 0fa362bb59e00056193ab6a02cb49453d7ef9a7c SHA-256: a0990cb7db06820773939383837af48e28530f37124ef63646890c65663036e9
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various websites, some of which appear to be compromised. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. Embedded JavaScript was also detected, suggesting potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/jvp53fadb5ga60tohekm8ra979/vogitotaxez.pdf In PDF document text
    • https://wendi101.com/userfiles/file/67900272872.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tazug.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/subor.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/13480798475.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/zatodin.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/5051942510.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/49156222894.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/xelakazuzofumopix.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/kebobisusejef.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332505038f9---kesuxadenagakaja.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/20996961212.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/kikifiruwadatomisuxu.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/31023012915.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/lesoxudodejetijarowabatok.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/64007020245.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/lowebowaxajotowosagav.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ca2b55921c40354d36ece9ebdfcb720a/31487469480.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/febuwukenejejoragi.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/15504304921.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/7307520968.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/badupifiv.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/7e400812cc5dd8ff1060168b8e060615/46921528143.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/bujer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sms+handcent+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CA 10664 bytes
SHA-256: a975e7b7d6737cb2545891e59e3f32b75a7a2cd725e9f075873f22b429f1489b
font_01_sfnt_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_03_sfnt_off00010bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 18064 bytes
SHA-256: 64df819bb20142fe031b975ea0541619f30d18eb0626eaa406afd32b7853225c

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