Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec82604937bfb4f5…

MALICIOUS

PDF

90.1 KB Created: 2021-07-03 03:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e97601e9d7b2c7d17c2f941649ef69a0 SHA-1: d6a46286249e156173c422e3b98c995104bb4d5f SHA-256: ec82604937bfb4f524ed6ba9c17043f6fe80af8ff3657d1436462dcaa1e72767
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16099fd5b0e0f4---foresetebivenexek.pdf In PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/wawodijubugu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160839a816b98a---13071166581.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093418fcc53d---84165439460.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/8f57aee0032217f7b252e2503a56ce06/fowuvidezotumezulifota.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/97229qeqrtqbv6e148sdgpajr7/97664241700.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/fisobenojoxuba.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cadc6359b---21075394537.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/42895849982.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/zosove.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/cinnmm5g1ffhvs0l459jb7qpoj/pixogakuxigoz.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/pabonolenokigodud.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/ragerunosagubepig.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be33e873483---jogasamufagamimik.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/35160023285.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/1ar4u35djhp2slu77ap1r22fhi/wipanusifixowugokeju.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28429425bd---wixabibobufiwedoje.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099af9436396---fejikabonowidazodax.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c751593afe3---39203608593.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f1e318a89---20202605644.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef3607108---rolabitoves.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/zirifagili.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/jjn0e8i656up3j89vijk0s3ba9/74038709814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sd+movies+point+kgf+chapter+2PDF 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_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 17332 bytes
SHA-256: ccc2c24cc023301a186bdbc701ef6edd6df1d2789ad3a29bdd235bd442d8496f
font_01_sfnt_off000128a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A6 11372 bytes
SHA-256: 48e80ebbf4f21a251ad5a6a979469f3ac0802b18d20867505763911add5d7c66
font_02_sfnt_off00014325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1