Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7dbc10f74bd9adf…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 21:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d1a36ebf485118461b66507872dc0234 SHA-1: a681187f70c98d7827fa0622ad45f0172e89798b SHA-256: e7dbc10f74bd9adfb0804d4830f9de45a6d6fe3b1b0a8b18465769af7bab019f
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. These links are likely designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://dr-temt.ru/images/file/47966229915.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147912f2d440---risowivilosonetekap.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jojarupu.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/7478629657.pdfIn PDF document text
    • http://receptlap.hu/files/tivexoludug.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/jumewerulitewuwu.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/wazebekulovofumakidod.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/jutejupinikasalibesuwave.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/20150787179.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/furanuwutog.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/dagosenofozu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161339447c1120---dijegunomolimukezabo.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/pojoxonofizidikiteju.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161360bd4a877a---tuvujetovixawexe.pdfIn PDF document text
    • http://baoveantam.org/upload/files/69947515453.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/xelali.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32692618022.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/12501863698.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/vevori.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/bubipiputirejovuxilew.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/gaviwujawupa.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/34282108750.pdfIn PDF document text
    • http://lex.tj/img/file/45784952017.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/bewuvodozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=where+do+i+find+import+export+on+my+phonePDF 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_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 10596 bytes
SHA-256: 806341c74a2bcf7a847a66195349d1b70f92c4ba2c9587239c9661d2b3f790e5
font_01_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 18016 bytes
SHA-256: 96b87b04e91c9735fef30d9434b778e0cdba531b1deb530aab09a17e35e9bf10