Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a743bd257df78e0…

MALICIOUS

PDF

87.1 KB Created: 2021-07-25 18:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf7eeb0641902d150a9a13c354c1d940 SHA-1: 01876f6851708a6712236b03f77284b5e4c1c142 SHA-256: 0a743bd257df78e0bd0cfb59cebc2436f7396278517ce9729e78ddddd9be848f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to trick users into downloading further malicious content. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22e4c438dc---lomaluz.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/526e3dae4281f8e94b3d020b69d61f1d/xikividisolesokibugu.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/847cdd8168187451a9743b5fc9654f38/26396417983.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/gomci2ss5v740ajubud48ugml6/sakalarujoxuzuvovozogon.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a92c10e19b0---96555224712.pdf
    • http://bandenplaats.nl/cmsimages/file/68447297718.pdf
    • http://www.aadhar-interior.com/userfiles/file/16545488587.pdf
    • http://busanpc1.com/upload/fckeditor/file/josikudonivabakopor.pdf
    • https://burstallconrad.com/editor_files/file/17670084584.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ecf2c17480699d276ef733dde05cf484/porotiwusujinogopalajosi.pdf
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/vejebonewunelatud.pdf
    • http://n-production.com/upload/fckeditor/file/xapekerave.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be08cdb1bd---51364376081.pdf
    • http://lubrifianti-auto.ro/files/file/39560489931.pdf
    • https://rachelrom.com/rescontent/file/31407317087.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3416efdaa92332e87d138ca8fc520480/zebepizezovakukelusanuz.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/b3616737d2791e4ea75aa7b422525301/wugamagapawugunawir.pdf
    • https://jobtiara.com/files/files/62321314330.pdf
    • http://clairerolo.com/userfiles/file/55784842947.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/q81mpvdtaut2il5kdero3u3ei3/97512940585.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bvvrv2l0c5otdusltntpntome0/nopus.pdf
    • http://tilestone-pools.com/i/File/vuxupexiginub.pdf
    • https://angkoronetour.com/userfiles/file/dipofonisujololif.pdf
    • http://artecgroupservices.com/imagenes/file/15000909928.pdf
    • http://budoprojekt.eu/obrazy/file/molusufozades.pdf
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/punorofelomofetaf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=gravity+falls+journal+3+blacklight
    • 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_off0000ecca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 16792 bytes
font_01_sfnt_off000104dc.bin
4775244df47768e28ee61a2432be0e80e65a76d2bf305ae9b62bd66281409f38
pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 17832 bytes
font_02_sfnt_off000132bb.bin
e3520f0516b65ec3b881066403d3f7e8d0b10793dfb8b3ba3648a3e2015c5198
pdf-font-stream PDF embedded font (sfnt) at offset 0x132BB 11336 bytes