Malicious PDF — malware analysis report

Static analysis result for SHA-256 4741be549138efa1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 10:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22947c00bd64aaf1d371c006b8d00f17 SHA-1: 11ee8997c780120eff53bc2c41048bfca9e12ae8 SHA-256: 4741be549138efa19e9c43f14de8757c890f6d614f5ff8a9419c0385f4ff0acc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for executing malicious actions or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://skupka23.ru/upload/m/jesovep.pdf In PDF document text
    • http://oresteruggiero.com/userfiles/files/lonejirema.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/64063933711.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/xoputipugurisulasip.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/tubexupemovekuro.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49c9e78b84---90119054169.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3c04a16c9---lovaxusekub.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/55504852844.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/9932ddbb3a624a337dafe4e6b3103a73/kovolipamewa.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/wenidisoromolareluzasesam.pdfIn PDF document text
    • http://attlas.center/userfiles/file/15148486132.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c40d031fb43---48087766453.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/50537416481.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/figajabolisutomi.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb7a1136d8---rojebonewu.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/fagufureli.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/63qtqn8re8s7o5o4r8faburmr6/23590605854.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/44795619242.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/bujegirurusikavog.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/70670058551.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/54942348923.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/majunepil.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/4724067151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=anger+management+books+pdfPDF 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_off0000d862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD862 10916 bytes
SHA-256: f5523b7c4372da559b779db0c4ec111847ad3f7f58485cce6ff0c0a1dcebd866
font_01_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 17484 bytes
SHA-256: 29199f03182b4ddfb2d3a46c567c2175512d74062c5d0eea964eca9d82d885fa
font_02_sfnt_off00011dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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