Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce82ec3901854ed2…

MALICIOUS

PDF

72.3 KB Created: 2021-09-14 14:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e244e3db1c79a2411ef3beca3f42ed1 SHA-1: 2f3473221aa1c70520ae469fdb91f345f9b24c33 SHA-256: ce82ec3901854ed26af1302c448611ce99581c857f67bd8d25064256d8979662
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is also noted for duplicate object bodies, which can sometimes be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=how+to+remove+truecaller+dialer PDF link annotation
    • http://everestlodgelukla.com/userfiles/file/58466636858.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/67984827645.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/zikilejurefagosipuxo.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/21865215618.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130566447454---gopurakuf.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fdd52e3e2---5730014697.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/24013264771.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/pexoposim.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/22647772819.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/97299746969.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161342ce844088---90961113134.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4d40f21d77726172c2bc23003086e91e/40571533427.pdfIn PDF document text
    • http://charivne.info/images/file/50421122279.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/bexaxeleroxojaporapiwafi.pdfIn PDF document text
    • https://asiapharma.la/files/files/jatelapunabexavomobedo.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/32046450635.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/buluwajim.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/22826336392.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/666b80a3a9229ec8a6509aff78d69f74/52910744486.pdfIn PDF document text
    • http://kbchina.de/upload/43103315560.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/neveg.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/60774858803.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/45587821579.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_off0000bb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34D 15924 bytes
SHA-256: 10789e9e958112070efaa2a4d19dfee82bd34f60302e3373be9db4838eca1e7b
font_02_sfnt_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 10504 bytes
SHA-256: 58eb7b12db8641c41c3382efb4df6cdb4c44dcc50eef26adf6c5be11c49fade0