Malicious PDF — malware analysis report

Static analysis result for SHA-256 e521131fec2559ba…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 16:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 96af1a45d0bbc90e06b697c7fbecbedb SHA-1: 8037b255bcf55bd8f5e6f74eb4246ee61a15ad3a SHA-256: e521131fec2559baf5f239f6a846f7978b8de60b04c7b9fee3e4f842fd869a16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of `utm_term` parameters in some URLs indicates a potential phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://catamma.ru/uplcv?utm_term=mp3+snow+apk+download PDF link annotation
    • http://safiorida.nl/operatori/userfiles/file/75723009911.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/31287915027.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/54961252153.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/21868643505.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lojagelugaxaji.pdfIn PDF document text
    • http://eventechsite.com/files/files/78510979253.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161438d8ebbe1d---53416831041.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/45494137148.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/kogukevube.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/poxebidi.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/5500412805.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/zaxikalixaretozaka.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109170455092972196es5l8ozchg3.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1264f750---balibodafol.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210922_FB171496DB6F2B4E.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/28977493066.pdfIn PDF document text
    • http://hanleyresources.com/images/gakufajojofapudunugi.pdfIn PDF document text
    • https://bauarch.bg/files/megowuzupevepapupejomek.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/nerul.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/xokadagukufafuvud.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/65705850264.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161494d9a8d16e---45120453757.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/tidezarujikin.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/98299467447.pdfIn PDF document text
    • 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_off0000ae7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC695 10304 bytes
SHA-256: 512cf54e596717963d8b54fcb758dbe8fe261510fd1d197d1236dee3cf984c31
font_02_sfnt_off0000de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 15072 bytes
SHA-256: 965c299b3e6d5dd6d343b0855395807cea1c91311cb59b9b40370ec5621f0ce6