Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42dc1d18fc0c145…

MALICIOUS

PDF

87.2 KB Created: 2021-07-03 07:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 52dec83a5a15a82b1d398c8b34d672a9 SHA-1: ad1785ebb9efb3336f4f3a5a52ed9b4bc8983059 SHA-256: d42dc1d18fc0c145a8394b803f521f0f37eed223f89a540506326e2bfad4af2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. No scripts were extracted, but the presence of external URIs and link farm characteristics strongly indicates a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://allytemp.ru/uplcv?utm_term=live+wallpaper+for+2+phones PDF link annotation
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/b1f588a2945b6934bbf4b3b4b1fed0d4/39633675093.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/lf2km40ft7bl22e2nvqd7m2vnk/zarivewapalusutuponos.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607177f8716ce---42253617508.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/60539848644.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f69b651694---wonitesewininof.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/d58425cb925d234975601e0bf1e694ce/20472593206.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/gtmvdj2ul68tvva9hequq1c3rr/71075012180.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/gpdnsduro8c652sq4ohicpbo87/53046355278.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e66467fc03---2508281494.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/38e1e00dd639d619832b90540433af67/zabadovunisuzisozoxag.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/e0c44178254d9e5a8ced8227e48a8b5a/tijokomonufukowugup.pdfIn PDF document text
    • https://actor-conseil.com/files/file/soxofo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c9c72e77f41bac4453e8ab44a0553031/35188117139.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd6d333de7---65396205957.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16072180094762---jovubevuwizoxuxapalivemok.pdfIn PDF document text
    • https://thechoose.it/file/88452892491.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/85199559565.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3ba1ef9df---konijigesewupitozafixe.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/burizu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d641bc97f---jamerafavigafiv.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5e25e00e---80188247283.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0e286ba15---37077266720.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a32af85c58a---zimog.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_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 17300 bytes
SHA-256: cb3be6e10e369afa5d28c561b5b6bf045b21b2665a9145b317edf0660c64f134
font_01_sfnt_off00011df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13610 10584 bytes
SHA-256: 8644bbc7ee4d9a0e1ca477b12d94809feec22940825214a18f12f2407ca57de4

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