Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ba22c0db8a79a2…

MALICIOUS

PDF

74.1 KB Created: 2021-09-09 01:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f68a8d57e10c2eb56c1dd07507ed3932 SHA-1: 8b080a77642bec3afb269ca245b5fc860eb17111 SHA-256: d2ba22c0db8a79a26f756cd18a1166930052895709d4c5fb5008e8b8fa8edc8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to direct users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tensoinox.com/userfiles/files/92598045677.pdf In PDF document text
    • http://sydjpg.com/images/upload/file/20210905_073702_180.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/21191000023.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/70587259089.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/jabiju.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613166f727e9d---19079553851.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/86359217717.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631137491.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/90157047146.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/22453754111.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/122577408.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090209525211.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/87226722958.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/as9djpd70ds7sm2kc90q9pf77u/45410357991.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/riserarupawosusuf.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/komisukuduniv.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130607198f8b---zadubavoriwukuvakinibax.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/29270686593.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/kenepefepaz.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/99166865497.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/56468391796.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4a555778eb604cc160f478af7ef7cd32/78868223952.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/jadorerisibanid.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/rofafawizogur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+camera+barcodePDF 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_off0000bda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA7 10340 bytes
SHA-256: a8725761d775853e59285e0efcb46d32f1d66178a42be13d1017e84a9a68567d
font_01_sfnt_off0000d4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EC 17700 bytes
SHA-256: 8c45f3ee25a14c9498c661bcb8e812d409e29a303a1316cf537d3d6919ceaa3b
font_02_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1