Malicious PDF — malware analysis report

Static analysis result for SHA-256 567a7ac12f2b57d7…

MALICIOUS

PDF

104.6 KB Created: 2021-09-06 10:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5bc32e0e5f944ea10ab3844cb277b3db SHA-1: eace8a8b43983e426206348286a94204dcba3ba8 SHA-256: 567a7ac12f2b57d701f689c478e0b2ccf6de2400ac901ea188e942a3faf25435
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, forming a link farm. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent, likely for phishing or malware delivery. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ristorantebiscione.com/userfiles/files/tesisutimufotil.pdf In PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/babogawuxizilogagumapawo.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/541a1e6bac7a2352d0c172b531efd345/kenaduzudifixebuwopodexe.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610739d4b097b---21394134531.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/30451094438.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/0ms0bdkbv5451qkno21rtaadfh/18856058392.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1624889715.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/99575306380.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612427c32136d---xiwaxotemixosiz.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf4e9b29d0---15741115129.pdfIn PDF document text
    • https://teamcode.net/upload/files/56926064701.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/12178690465.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/6uq3ca63oj49jtjjksgv86sisq/zebidawebikarumo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/23f51bd3b670de81b408efc1e8e9c327/65380232732.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a02d8cbf---badesele.pdfIn PDF document text
    • https://tpk-m.ru/files/file/20225561177.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe14eb71c2c---45433586389.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/89882544002.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/kiwutinowonawa.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/4ptodnlpumlkuhil3l0urm1hue/49319808899.pdfIn PDF document text
    • https://edusfera.pl/upload/file/moduferulo.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/megiwujokuvemu.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/mesukikitibagivejuxeroko.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/83987710137.pdfIn PDF document text
    • https://eklyps.net/images/file/1056716268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=rhinoceros+full+play+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_off00012fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB2 10880 bytes
SHA-256: 8859936aeb8bb7d33f34955a31f3c19f6b6ae27d105be39a7d5938444fe0f71e
font_01_sfnt_off000148c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D8 19944 bytes
SHA-256: 8b9d653c31198f6ef610a6b606fcaebeb6d9801e852663c510e441d6e3ea3857