Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ad23169d344de5…

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 04:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d012923bdf5b2b3ed46167386855a44 SHA-1: eb57f4e989eb0644876a0a565fa78d7cbb328ece SHA-256: c2ad23169d344de530424931aad61a2801b9fdf3bc61c84e1f8298169eb75108
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to deliver a phishing or malware payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crysiq.ru/uplcv?utm_term=queen+of+hearts+full+movie+download+online PDF link annotation
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe92d137df---27644909172.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/tuvejefovadetenubana.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/81412421218.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/jekasizinij.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/8399662675.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161343b21a4386---8479487314.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/b2eafc48cd3eb53f4330d3dbaa2524a0/rijemekegufujexofetupebud.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/rumiwo.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/51603124550.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/67141601996.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631301621.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/fufisetazaturerifusa.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/16736013131.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/57472669262.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/ralowigatimati.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/79064845360.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210904125136.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/wujifavogaronoxu.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/bepubumowutikotiwiru.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/29239190040.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/pimoxapigurubog.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/24c901e21eba51294e5821174df8a89f/xareledezumodiwekiwof.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/totadoko.pdfIn PDF document text
    • http://thongthien.vn/upload/files/40654145954.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/75757189661.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_off0000d1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 17348 bytes
SHA-256: e6f070afa39145ca37e6cf9567d48995515111685046bd896f4ba33aef606c0d
font_02_sfnt_off000116f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F7 10928 bytes
SHA-256: 7e039cd02eb43ee73355efe1502534c6558b338c3263e45150bad93b17f6e078