Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41332a24c54d330…

MALICIOUS

PDF

90.1 KB Created: 2021-07-18 07:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c1895b110364ace377ab0633b5d797a9 SHA-1: d10c4d572d627205311e5512216b2895db8c8e2d SHA-256: b41332a24c54d3307f0da051e7500be83dfbdcf0e436c632b86a33580e9e1a37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable, but the heuristic findings strongly indicate a malicious intent related to URL redirection and potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f36636b0635---22591215915.pdf In PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608019c5b66da---vubisunifanakonaji.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54e5b1308---79239658406.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/d85a533d8b6fc57d160ee383097d106b/pujipugawoxisitik.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a35171797a4a9aacc9aa6793bde8492d/bebafakuvexudifoxedamuli.pdfIn PDF document text
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/lemosibadozawaxigilifidor.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/4066886546.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a317fac1a43---siwatare.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062309473373499.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098c05292d04---42693133443.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/2bf579c0b4b23a68c2cf956e6518c64f/11983732820.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/8587828882.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/nozogovusesu.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/guwigofome.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091810d6d356---23407791576.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/difevofor.pdfIn PDF document text
    • https://eslms.com/userfiles/file/sakemizagubesuzarowukebar.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876dbf7aa95---dekazilonowodutafed.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160761535b27fa---joniwebebiwifuvizelo.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/daraxenuvikokosir.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a74115903ae604983c8bfd97343bd807/71192153632.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/c6bbb9dif5da32pumbv6vhe2p6/natisokajakumibobenusejav.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/32367293563.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/95524184818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=simple+plan+perfect+livePDF 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_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 16180 bytes
SHA-256: 1fa234cd19fae3947b618347540f1dd21ee8f5749d46e751f298c7ba81894809
font_01_sfnt_off00012b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B72 10492 bytes
SHA-256: d4627732308f9b4055b14d1c8391361d63be87484627c980e499276e90045b6a
font_02_sfnt_off0001434d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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