Malicious PDF — malware analysis report

Static analysis result for SHA-256 38003fcfe4af0030…

MALICIOUS

PDF

81.7 KB Created: 2021-10-08 08:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bbf74e66765b325decad5eca5ee28696 SHA-1: 292339ca6b12e53d40bcb5541661065289152992 SHA-256: 38003fcfe4af0030d145ad8d0229de59ade13b53da6481c1455e53be26c7704d
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites. Several of these URLs are hosted on compromised CMS uploads or disposable domains, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://unitec-egypt.net/userfiles/file/64053674222.pdf In PDF document text
    • https://defrokatilai.lt/images/files/zomumeguxudufazafarosolep.pdfIn PDF document text
    • http://ukrfirework.com/images/file/vukerajodazidorufeto.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/gugabanujasijo.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210919082155.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/bavosunepikibitavevugub.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/lipibapoxabemuzezefijuzop.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460ad7c2ac8---92027677946.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece2e18c50---rewupexodegilem.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c5390e2f050d25e68e16420b03ec2378/kagiz.pdfIn PDF document text
    • http://cataga.de/beta/files/file/milimoninatexefeb.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/wibobusul.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc4b391d02---58336772388.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615a78b4ccd2e---giraxadadememugufu.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/10763771856.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109180208294134.pdfIn PDF document text
    • http://kelvista.lt/images/files/babuzatukik.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/84844482113.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/lasawavasumatejajunelid.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/pajonafutufatosuvaj.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/novirogategadavaru.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/zukivuvodiwazadijet.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/kuvojofinigarazabaworipo.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/65928270533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=opening+for+manual+testingPDF 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_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 10824 bytes
SHA-256: eee04959e2984c28aa009a7ac083eb3b9150cdc954d40cf9d62c187c488c6dca
font_01_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 17724 bytes
SHA-256: 15063c6a00a310d47466ce5c7a4bd0cbb91f21db57d28becc7180da2210d98af