Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d22b06cd5e33949…

MALICIOUS

PDF

119.5 KB Created: 2021-09-05 08:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 06190c09cc41a1f184e87a2a0ddfd407 SHA-1: 7a31bdf24e94d6c4c5f7ba212069a6a4742c971b SHA-256: 9d22b06cd5e33949765939fc58e561a4b6f7d87e1a072d68fb2961be572aecf8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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 http://busankid.com/webfiles/board/file///21930366904.pdf In PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/25434cac63e3a5519f8714a2276a2c3a/73038010530.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/3mr5mia3i88hrq9s2co349nhe0/2380696576.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/94900202515.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5968312c4b---vodevesavamarogel.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210608192447.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/36280193349.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080110837d7d---51679261036.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/tuwuxukaf.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/putagizejufatapom.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/47535001699.pdfIn PDF document text
    • http://islandpointfl.com/userimages/xemipogapetepewi.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/58188720983.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/2eca9a6fec1ad7635284f07a1f4e7f7c/rutilebarokuton.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/713bca491635ae1f0490f3d4c7559d33/kozenapigomiteludavekule.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f99b6f629---kutiva.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/54161345548.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/gaxixisikukogexikumukotox.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/26/file/77763053410.pdfIn PDF document text
    • http://www.toptehnik.si/images/52852242354.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/bilipilatobamilovivon.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ha2smpu50t4g255hkcoi6b1jj7/mejagosofaloden.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/64513279305.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/2027811893a1f2cd6c8bacea31039c4b/20764060562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=animals+name+list+in+english+pdfPDF 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_off00016dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DDE 10708 bytes
SHA-256: 0738045ba028d7c407ffd60c4df75da0455a56ef424fc3555f0360f255c229c6
font_01_sfnt_off00018603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18603 19344 bytes
SHA-256: 726fc6cdf78f7c19bbbe2ad31902bbb712873356ec5e849240a2687c3d96eb74
font_02_sfnt_off0001b82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B82E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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