Malicious PDF — malware analysis report

Static analysis result for SHA-256 0711fb1926783097…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 07:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00d4d64cecbc8ecf2800727c004b2427 SHA-1: 824e80bcdf6c009907a73c681130c10496a23c62 SHA-256: 0711fb1926783097a9e372a7b70094e574753d232690cba3e0df99e3db29df9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a 'utm_term' parameter in one URL suggest a tactic to attract users with search engine optimization lures, specifically mentioning 'fortnite free v bucks generator'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or initiate further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=fortnite+free+v+bucks+generator+without+human+verification PDF link annotation
    • https://iword.de/userfiles/file/xupixilo.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/musedutasogabuwudasifawo.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/399277224613a656922ff9.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/29677370863.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/wudijiriganodubenoz.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/luxerilan.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/fivusuramudu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb188164ef---37348690714.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/8817426087.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/54336117092.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/wavawisirobozo.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/59069117783.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/57742872912.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/42615124229.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/6690352159.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9eda81a7---94305592322.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/javameruvapexokotibu.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021092911242873499.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/9832574451.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161315500d7ac5---47942757998.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/mamewaka.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/98268188759.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0158da14b---51538088359.pdfIn PDF document text
    • http://waypl.pl/upload/File/nijudowijidikexufu.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/59380459167.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456632798f6---viridepexu.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_off0000b262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB262 11196 bytes
SHA-256: 5ae6bb22c93aff97f77967d31d95482ff6c8dce78efa9257cb21944c4a3c3252
font_01_sfnt_off0000cc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC84 14688 bytes
SHA-256: 8eda201c20cae2d2072a8a56d9ebaf99918d46135f85701b708224ac80b284e9
font_02_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1