Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62b5d369cf3d8fb…

MALICIOUS

PDF

88.9 KB Created: 2021-07-02 10:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 489c07038a0f32ce63e1bed70f553681 SHA-1: 66d86684ffdebe2594c67b909e2072c3093ea2dc SHA-256: b62b5d369cf3d8fbb98617249e7ef1adb7b97bf1c90d8fada70c332df5f356e4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that exhibits characteristics of a social engineering attack, specifically a 'ClickFix' variant. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting an attempt to redirect users to malicious content. The heuristic 'SE_CLICKFIX' indicates the document likely instructs the user to execute a command, a common tactic to bypass security measures and download further malware. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://irlanc.ru/uplcv?utm_term=windows+task+manager+command+line PDF link annotation
    • http://armanetti.com/images/bekaxofijuzikamexuzewi.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1ababb5dc---96604282303.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/17989347605.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3ae7463b1---53393022569.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783580d9589---parajogadi.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/saduxuwovesem.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e29370b5b---movadenaxuzadalatejimu.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210624184715_1941597349.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5a722d875---bibemugujudofo.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/130fb3a00acfec65db26db341b50233e/48591243019.pdfIn PDF document text
    • http://artospace.com/pics/file/62606907077.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/kedatexikerib.pdfIn PDF document text
    • https://hgb.se/filer/file/xuwef.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609447be9c897---piwinajizabulezoduniredaj.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607de88705a85---kegesakerexepedimoneged.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8a5ef6090b36bcdaf00ae86971ce9cc4/44185717356.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/5371f29940462602e282595da6b1f656/42085007395.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/11099002429.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/gevebitorelekunotofezam.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/miberogosofepi.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adc285bdd49---94578575283.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/duzukefebiwukewuzogob.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/73269588063.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095793487225---nadaximapijosu.pdfIn PDF document text
    • 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_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 10884 bytes
SHA-256: 277853ceb5678bddaad997310e09c55a8657f37d333ce2297a1bed7c6991ab98
font_01_sfnt_off00010d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001251d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251D 18360 bytes
SHA-256: 8af7ac969c6225c53ce331aecadbf7f03aebf8f099b2d0abfdcb04ab23126936

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