Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdffad9bd700b26c…

MALICIOUS

PDF

97.7 KB Created: 2021-07-09 03:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ae3c549a058fd137c6e180e4a331065 SHA-1: a30f970f9c0f2cad56dcde7f4225569ae7376214 SHA-256: bdffad9bd700b26c37a4d400cfec8f354e2e08db3865bd49d5aa48fd51b10b52
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content or downloads. The presence of multiple external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f7e728c88---6107282828.pdf In PDF document text
    • https://webornate.com/viking1/uploads/files/41563491054.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/96869272542.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5ffb0c3b930add2754e3b2a4d558c505/pufelijiwuzoxoletifezase.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/85907763389.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3f79b407390f62fd720e2dd692099a72/94298219428.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210617215253125.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/5f2d8a431bc9e5ed9d591f839e1757a9/zezubapilenidomaj.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/80341390042.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5b09ca30---zuzitalamigisizuso.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741f23a7684---76540424402.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/1lph5mhhtdjd80the5md0o3vip/21342293189.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/raxareraforabuteti.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/35864090789.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/cedab7d5271be29da588282876fb62e3/75021359334.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098322fe484e---dujelaxakazekonuvejoranir.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/3005510566.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/54120681527.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce7827a060---lorijujikep.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/nekavimokasikazewasuw.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d168bc7dc---49227213793.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/gofirax.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/civ82j8ts4s5ujfsqofjvkhekd/62292896556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=general+chemistry+virtual+lab+titration+simulation+answersPDF 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_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 18604 bytes
SHA-256: c24c90071a638db6615413785aba06a863626e9d9a3552801ab1f99f70e54d6f
font_01_sfnt_off0001474f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474F 11040 bytes
SHA-256: 4905b2030db0e93529afe3238d822021a50532e6206963f42151eec0670514ce
font_02_sfnt_off000160ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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