Malicious PDF — malware analysis report

Static analysis result for SHA-256 022eb887687941ec…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 14:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f384eb087aaf037c50b8f9eb4ed6c61a SHA-1: b64a6097071869346b0eed8f109a29abf0446f82 SHA-256: 022eb887687941ecf996017e9f8e76f20a37ce8122d9f72092c8af2ea2de5108
156 Risk Score

Malware Insights

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

The PDF file was flagged by a ML classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites and potentially disposable hosting. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/fb9a4a71599ac07d88a3f1b4ee54d9a1/baxakuvikekak.pdf In PDF document text
    • http://qqwandai.com/uploadfile/file/nodekegunuvobukurotinanif.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/farifapozanujixupa.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210906171501.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///muxefumasatiliburenijo.pdfIn PDF document text
    • https://majubesar.net/contents/files/wimowezalefubama.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/68994520515.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/46221577997.pdfIn PDF document text
    • https://icbacademy.com/upload/files/22243249651.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rret4qds5cvan8cijfa8q966of/dunefakulebi.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/nilijigisusirupi.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/90910665171.pdfIn PDF document text
    • http://delve-cr.com/uploads/74297332828.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed127c087---89750701674.pdfIn PDF document text
    • http://packamate.com/userfiles/zomepala.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/57655125769.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/12823074165.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133faf477590---betupidijulodu.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/juvet.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/51335690506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cd+key+windows+7+ultimate+32+bitPDF 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_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 11212 bytes
SHA-256: a23acd2a02b5c5836f9f3bb4615eb3a2b634aa22aa344f5a56e92c18047486ee
font_01_sfnt_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 16944 bytes
SHA-256: 6cf33ec6e0bdd79f2a8922a3577554d25ed2e1b61773260238366297fe867850