Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e9bec683e0dfc3…

MALICIOUS

PDF

69.9 KB Created: 2021-09-08 21:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 91a4b1f6595fd2ebff4d04eb1f83a259 SHA-1: a61966ef2b16ca8b9b16a9caa71d631c59bd8550 SHA-256: 52e9bec683e0dfc3ce32116bb15fa979c2188ad9a21ea905a43385114736048e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a link farm, with many URLs pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document's structure and numerous external links suggest it's designed to lure users to external sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132fac3cac4c---56664828818.pdf In PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210905192202.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/41263324919.pdfIn PDF document text
    • https://cet.sk/res/file/64885142161.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb3f9eced2---kagoxuko.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/bofozutebunogipakon.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/boxojevixuvenutema.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ba54037aa6fb1f0deb5ba8e5fc774b5a/xuwatugibik.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/29999034325.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138372b48243---gobil.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/lebapilenaborodewera.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327d43d5e70---90557647179.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/wefusimujimutixukop.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/12125544226.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/zubezetuxatokos.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/bowujig.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1a565b8c---dukafutemisebivi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b304d7dbf---bagufibekokexisuzigenu.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/49245947600.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/vadifitarakob.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f074567608---22299238565.pdfIn PDF document text
    • http://recrute.fr/files/files/jumevonimojixebeb.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161386649337a9---xujetobamexatajojopimi.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/43308033078.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/rivenifosudopidokutaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+printable+double+digit+addition+worksheets+without+regroupingPDF 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_off0000b42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42D 11068 bytes
SHA-256: 732f2a10bf33eeb955104b1f12fec22d12e3b67c6e69860a794b30575d67cd70
font_01_sfnt_off0000cd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 14436 bytes
SHA-256: e41fe6430e722cdf80b2a266ee10f31580c917fda0f0ae6ddab1ba1f480fd165
font_02_sfnt_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1