Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4d0b562455c460…

MALICIOUS

PDF

89.8 KB Created: 2021-09-11 22:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70fe8a1b759f0ff3531beea97aabcdda SHA-1: 11869a4fac1e14afb7af209d0cc4a15cedf712d4 SHA-256: 3f4d0b562455c460355bb32d8ebc10a1f5aa41b8a520feb77da0294355022ece
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure point towards an attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161361adbb7eba---disikigizugabemuguderubad.pdf In PDF document text
    • https://noticky.net/akce/fotky/file/femanukuw.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/nagitomuxujokarawapa.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/zetukevurisinuvesizase.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9175617f2---29064112085.pdfIn PDF document text
    • http://mastervin.ru/files/file/wapevededupexamed.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/mr9gjhb6k93bqoh85as7vvs0c1/49413958454.pdfIn PDF document text
    • http://djapm.com/userfiles/file/wetenobimiparaxap.pdfIn PDF document text
    • http://soles2walk.com/data/file/23514827603.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/pituxamuxowelexes.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/93091244870.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109072250168171.pdfIn PDF document text
    • https://hssanesteban.cl/files/berutaxej.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/sobaloxavojuwemu.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/17805116349.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3fb7eb279c964c004be11e7690d3e07d/zozob.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/keripanigofopivenokeweni.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/zodewiputaziv.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/63803636142.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cfdb20406---gokotoguzexuvujuwu.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/sotapabof.pdfIn PDF document text
    • http://dsagco.com/Upload/file/nisemagifesozoxadi.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/1941005116.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/55352103274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+you+change+location+on+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 10772 bytes
SHA-256: 94e494070ddf7096420322061ebc293f317896e54f60bab66942b16e58841cdb
font_01_sfnt_off0000f91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 17100 bytes
SHA-256: f0bc92d33481478c164c5309fdbe4ddf30fd50f3b3797bb7425ef43c6c060f33
font_02_sfnt_off000111ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EF 18136 bytes
SHA-256: 8d74c115e14b84822c12b4e0ac95b2a28719c4bd203dce0704175db10f887f34
font_03_sfnt_off000140cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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