Malicious PDF — malware analysis report

Static analysis result for SHA-256 2102ca569eef7e13…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 02:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 527603a528071a4a6922c2e6c6e83af9 SHA-1: 9ec8115a12e9a1ef7a7da383a31fa03eafecacc0 SHA-256: 2102ca569eef7e13a579bf20009b89758b4aef22815827489daab6d43a1c9555
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest an intent to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=compteur+de+mots+pour+pdf PDF link annotation
    • https://latgalesamatnieki.lv/files/file/57486646402.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/62813823365.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/26584402975.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16083eee75d53e---74733396736.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/jetexibewekagokekisir.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/46570362637.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/dofijazakalogilepojesuju.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/towiz.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/xosifurix.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/4fd1e53d06c1515aac57c23f2caea69c/debixinivipivifanunut.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825ca7e5563---lupiwakemosudowuroxaz.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e8fec14256---57253521733.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210723212016.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/48969607707.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/54jnpkrj5k4cp5akbo6756bqm0/fimafexajolaxomiwiwozob.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c06378572a114e8f20d9a85172ea9cce/15682657462.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/2775627660.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc6f03fedc---xegufeloxosirudo.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/56301788498.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/icq5et1tmcj85hpop6eijk2i37/pizoluxu.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/40057878267.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608165f30f20e---25107353539.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/39814348521.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/20135391346.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ae8b8b1d---penuvef.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_off0000cfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA5 20376 bytes
SHA-256: 03e7fb454fe11687cf6460c66f8dda36dc63f996a99a5df2d7d0dde2005bceff
font_01_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 10384 bytes
SHA-256: 9e2914fc3ec6b911d9a9257eeeba5230ebff50cea6ca11841b3f68c6d9e2d72a
font_02_sfnt_off00011ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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