Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceccf1ca00e35b48…

MALICIOUS

PDF

75.4 KB Created: 2021-09-09 23:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d4a7e39617c0669a229dc6abb36e4c4b SHA-1: ac3642b8d53b3873a17bc80946d4209b92d59474 SHA-256: ceccf1ca00e35b48a58038e0f834db40e6b8655c9e84d6aecd15345ea95271b2
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised CMS upload directories, indicating an attempt to host malicious content. Heuristics suggest it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. No scripts were extracted, but the structure and URLs suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161392351ea965---fobixizitibajinori.pdf In PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16132302da9ec0---posuxupopegenawobal.pdfIn PDF document text
    • http://tencanpowder.com/d/files/pekisoxu.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/9536786698.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/54200450515.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/liromabivixufagigovod.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/85548297443.pdfIn PDF document text
    • https://33mobility.net/uploads/files/welumomagodokuwuj.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/76414764686.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/fevenomakoriwavozaserig.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/16526842002.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/97651610503.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/daneresi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/452423246.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/bepamabonakamalogaguzogaf.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/xefot.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/negijuba.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/limotataxegesuxogo.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630947335/files/luzubutaduzorebijud.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/86206695194.pdfIn PDF document text
    • https://anandalaya.in/resources/file/telod.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/10279768616.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/12146287230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=undertale+ultimate+timeline+codesPDF 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_off0000c2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AB 17268 bytes
SHA-256: d4d8599439e13085527e8e1ffaae250d18b6438d6490b4ba88b572deb352d93c
font_01_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 10640 bytes
SHA-256: 13309a13f5bf07d5ac35bf24fc9550df79b8f8dd04d6c42741f381e82f416b97