Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0c427baa56162f…

MALICIOUS

PDF

114.8 KB Created: 2021-08-16 15:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f47bb0d653bbe37c442f5e38cafca1fd SHA-1: 58a9808358c65ad4ea73ef506b5edc44f17ec9aa SHA-256: 8f0c427baa56162f8c46bdfd4f598513099c3fbc5075e86fd265d2b7395c5a08
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload storage and disposable hosting. The document body is heavily obfuscated and appears to contain embedded URLs, further supporting the link farm and potential phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/n38b4uu7k1u67gpcsdmg5lckhg/vuxazudadekamol.pdf In PDF document text
    • https://greenvision.vn/hinhanh_fckeditor/file/3447631957.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/forafirate.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/ludikovikigiwifef.pdfIn PDF document text
    • https://highrise.pl/file/70219429286.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/9163422266.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ba976b46---74804123293.pdfIn PDF document text
    • http://hkalc.com/userfiles/99087283224.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/62046825434.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/18587705064.pdfIn PDF document text
    • http://minerva-collection.net/files/files/95995489893.pdfIn PDF document text
    • https://securitydm.net/slicice/file/futuzifete.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74c9a72137---37036222226.pdfIn PDF document text
    • http://prestopc.it/upload/file/pegibowi.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/31911911082.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/pazunimarezewepew.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b79782b665---sunininemopu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/511lmocd1nsqg6vd45m7gu4dvt/famukerodutu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073e5ce2efa9---74308479076.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/0c7d5adce56ce90347d6266a06831d62/60157742521.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/nrmb42fevbv6dt5kpsaqca6ptu/finumefexesifilop.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b1074c263---lukunimeridutilalifobeg.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a717cab72a1---42132666095.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/5medcc85f8pflvdumkln0kuh3d/sonifiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=problemas+de+matematicas+6+primaria+resueltos+santillanaPDF 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_off00015205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A1C 11084 bytes
SHA-256: ff55b33342599a9e9deb0d927413abd738bfdb2b62f043fb952d45abb1d106e6
font_02_sfnt_off000183af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183AF 21296 bytes
SHA-256: d36ea51f66e7f4719e2f6297e980a5b1e365b159d5b7861e46fb75abe4c08ac0

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