Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b49748c967f547a…

MALICIOUS

PDF

174.9 KB Created: 2021-07-23 20:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1fddb12f08acd8e1cba77b5b995ca15 SHA-1: 632a74ca612b226557a1cb6d242077d10b8d5dd4 SHA-256: 0b49748c967f547a065eac4d03ef0ed3d660a05f3dd105f36a8727faccee8730
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and potentially track user engagement with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f810925554---16695156923.pdf In PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/pbulsj7gnof3e1uv4to8v37gt7/21264813375.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/lixaxakifobezabavutomom.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/sugiwezupejiboxosof.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/rmnf65j182ef1aermcl0p3s9i1/ropunowurebufoziru.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6d972834e2ac40ea378bc7ebbcec3d3f/naresu.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099b519eb545---sefore.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3452fe52---xudesagalozadurut.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608be6b4ad623---37979669051.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/47mekosicra517cmr3fbdt4p0l/zururofiguxifiderenun.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160fa03bf0bf66---14098943464.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160807fffe335b---nodojevuzumekolekon.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0de8778c57---tamuwebetupum.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/lco8qk1h7nt7f37h2t12vpsvk0/sifuzupikuwilo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b498a9c9ae9---33794997977.pdfIn PDF document text
    • http://geasit.it/userfiles/files/getowarewapumizajiposuno.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/70861316199.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6661902a6abacd9935ab8cfd55b43e24/purowokixa.pdfIn PDF document text
    • http://onboardviaggi.it/themes/userfiles//files/rezitulapaxup.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73df2568f5---gifetifin.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/d7oufvnn19fksmoafl2l80pjk5/46580221241.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/rnurpfc12d7p4h3pdfvh4marjq/zuwoweriluj.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9f1724b24257a1b3764db8c9f9bcddc7/nisilibozelesejazevag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=livro+abordagem+centrada+na+pessoa+pdfPDF link annotation
    • 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_off000248ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x248AB 20872 bytes
SHA-256: e2a27cda6cdd017b9bb324112fa15861a5c3ca74b5f70395807415911ddbd057
font_01_sfnt_off00027bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27BC3 11080 bytes
SHA-256: d981bffe0f7357acb3ea096087fe8154bedabf85a18a8590b46d53ad3fc14e66
font_02_sfnt_off00029531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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