Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7efa98a5b5fe51e…

MALICIOUS

PDF

94.2 KB Created: 2021-09-06 01:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aae23a1306ffbb5d88880997de63fdaa SHA-1: cdaacc527dbcd7dbdacd2a0ee67211b01f602e7e SHA-256: a7efa98a5b5fe51e8a13373f39bf7a2499ba9797b2b7f4b2cceaefb51e61c1f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=chavin+de+huantar+operacion+pdf PDF link annotation
    • http://alpha-th.com/userfiles/file/bakakutipedesesu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a231a9c21c91830b8b5432e8ae9b0c07/6323679.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/30341673795.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098dc59345c7---fizefenuvazidavose.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/losinekusuzo.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/rigofuvilovezap.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/muvasugafuvome.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/tilijurixatepadezo.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a3f3c0cc334f87b86458452773a82593/79557764039.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607374a36bf77---tewuzipexeli.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/1sh75k1mjltcqfieom8gee1nus/69301210713.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/zukajemuwubu.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/99805389053.pdfIn PDF document text
    • https://la-klamm.org/Files/files/57419161017.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/sudonumu.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/64240265355.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/51313937579.pdfIn PDF document text
    • http://quaint-house.com/sowide.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/57b7168c30629c0e2fd2fe1a56117479/xusururidufudatotenul.pdfIn PDF document text
    • http://placc.info/up_image/luzalana.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160e1c29c7095c---sunukagifejuzakanavivo.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/kobowudenojuzuli.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/77066562717.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/nujezulawelaworezakuloj.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_off000107c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 10700 bytes
SHA-256: db3b832af24696a4164ba09f3c3d6e9a88362a1abe7f2e97b70c6d299861c640
font_01_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 19464 bytes
SHA-256: 18d655ee2423c0df567a8bbb00c6ff5c437470dda4dde17b58533ecc2cae14f9
font_02_sfnt_off0001531d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1531D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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