Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dcaff1ae1018fd7…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 08:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4f1125fdbe9800361429a5016a635cd SHA-1: 34a3968b837b3f4d97d786471a54f5cd0cd66387 SHA-256: 2dcaff1ae1018fd77cd8b3e1eb4373a335e422c40aed240a1b01f7f87f81dbdf
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://3e-recycling.ru/app/webroot/filesfiles/lerezi.pdf In PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/15187223038.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/0e230a8ede9560e02dbe984a46670c1e/wutapinidema.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/wulenuzulutagojafofij.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/011653328092.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/jugilemozoxe.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/nujadaputipadanovadase.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/pifipozawitem.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/76742704031.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/70447535080.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/zopaperoboze.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/16869148363.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/pexorezamanunaxiwilomonel.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161464140c8581---kemulutubamogumu.pdfIn PDF document text
    • https://alariel.be/userfiles/file/28402310801.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/bidazijoviki.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xikusurawapotufalifid.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/nkbdrinp017ad3etn3othpsq8u/13580019618.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/77276171870.pdfIn PDF document text
    • https://rinducm1.com/contents/files/mawasenufotebi.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/88635732399.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143f05a929f1---99301183464.pdfIn PDF document text
    • http://zenkatsu.dk/files/zilirijaseg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=get+photos+from+iphone+to+androidPDF 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_off0000ce7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7B 10756 bytes
SHA-256: f062b025eeded2a27ca5e81d44270d1352919056a79afa337d16fed7d9a4500d
font_01_sfnt_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 17296 bytes
SHA-256: d3f055813f422a87ce20ed00b3c99ae4dbe9382af173fac2045ccb35fd57ef28

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