Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf68a5fee5eb8c51…

MALICIOUS

PDF

89.1 KB Created: 2021-06-27 02:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1898e971e3f14391412840b0ddee035e SHA-1: 57a42a2d808ed374d30b6ad853091dcd8d3c0551 SHA-256: bf68a5fee5eb8c51c446cd49340b9006d831fcd5f212a2d5ef906238bb8f3268
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple external URLs, some hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/95174519251.pdf
    • http://opusincertum.it/userfiles/files/siregifoka.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/f968ce8a87d73fec44e15318f4680309/87204076556.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d43b92bcca7e2a242ef8de906a790024/nofotif.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609155b9841f3---taxarusuwigipizojoj.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/98317ebaf73a559ce157cda502d86d45/60118115506.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607039f57947d---64500070758.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f43638df12---kewelemilajufifozixol.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/erthd4g57hh89hhki44on4nl57/fugisosezijinavazusoxafiv.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16093c3147b9d8---62603895255.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160711826f207b---80849843856.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944d94c42dc---78450581526.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f974e53a39---womofobifidinuf.pdf
    • https://fwullong.com/upfiles/editor/files/bomibuwarabofovogusixik.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/5b25ff17c84dfcf7cce029a8d6d306dd/85183627473.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ba7d8tjfl6kiav58h3t94adgl5/giromemokupupatosikokonuj.pdf
    • http://ca1970.com/clients/10044/File/21048795683.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc2325183---10015173211.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/1qr6d40eipqv1jqigk3ntho98q/37908464126.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b00666f459040cf1d0b45ac192f5a878/36793866472.pdf
    • https://sayurhijau.com/contents//files/40908283636.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea800e6ee9---71253873942.pdf
    • http://grandinhr.eu/images/user/file/20950908142.pdf
    • http://deccanquest.com/konadnew/userfiles/file/zotizez.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/12b1rn6gltrikhs8ber81k2uvj/sasisoraverobeneme.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a988b530d23---faxusowukakizogubom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=eyes+watering+all+the+time+causes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb01.bin
3917ba0ea695df9378f273a200af5ea41277cd2f087d2cb50a7058e93a1fea3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 16616 bytes
font_01_sfnt_off00012622.bin
bf96d8d2ac10abef5d83182d37e517d608e80f6d07da2ebd5e5918c49519c753
pdf-font-stream PDF embedded font (sfnt) at offset 0x12622 10840 bytes
font_02_sfnt_off00013f0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0B 16792 bytes