Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e8bccd163ecc15…

MALICIOUS

PDF

88.2 KB Created: 2021-09-18 14:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a488aa60944aad96bf4744e266378822 SHA-1: c42abcee71910748471233d8b7db48926aa59991 SHA-256: c5e8bccd163ecc159398c0fa2e8bd0e9a59069d2ce1cdd1ae30c1ca3754409bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or initiating malicious actions. The presence of multiple links to potentially compromised WordPress sites and disposable hosting suggests a link farm designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://hebammenglueck.de/ckfinder/userfiles/files/20675907768.pdf In PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/darabike.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/majidadegelaperunukuw.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5838db3812eae6c577aec17b344f8ba1/lasepulutinekitarugorataz.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/71623569342.pdfIn PDF document text
    • https://ayurmitra.com/files/file/biwavekif.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/bawir.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/60824679504.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/42948474065.pdfIn PDF document text
    • https://dafelia.com/files/79156642778.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/6409778482.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/23304906186.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/72458193711.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/83992181617.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/47280243428.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/ponevuwagek.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/tanelezoperopezuwevud.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f0e024c0df592e8d5fcae69f686cf29a/towexeveron.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/58207177898.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e352db8c50---35091071767.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/48077651865.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/33570374501.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161317e9ae48a9---33817969376.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/3176979533.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210904223021.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/18534729737.pdfIn PDF document text
    • http://halmar.info/userfiles/file/pumidosuzaregorewuloxe.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/91358279132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sexy+jokes+for+adultsPDF 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_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 10764 bytes
SHA-256: b22fe0320bbcabe4eaf823d37aa2e337c39649e6af9e6d03cc0d8390f6c8e2ab
font_01_sfnt_off00010ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 18212 bytes
SHA-256: d461fafbea9eb17cdebe1f2e8606e1f5b8d51b471f4fda65d6d0885a81cca60f
font_02_sfnt_off00013b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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