Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8b50528a6dc42e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 11:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 021ddec30a45102efe3df8430a2624b9 SHA-1: 304cf874544b15519d4aa45b403b95ca9cbcb83b SHA-256: cf8b50528a6dc42e6e0f886fb08c206d4bfb5fa214446d5a40628a94f9e7acff
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to numerous domains, many of which are hosted on potentially compromised or disposable infrastructure, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://verkaufs-akademie.com/userfiles/file/33825295307.pdf In PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/31849843344.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/6460035533.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210903_105901_3136.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/28870817963.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146553c4f3a7---91715262315.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613797ccbbf5f---12322321878.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/14372473742.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/27444079918.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/34993675164.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/pawixajanogogevexo.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/29637797998.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/49801835909.pdfIn PDF document text
    • http://househouse.it/userfiles/files/xuvutagituxazagamopot.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/gatarejot.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145970121432---64466368443.pdfIn PDF document text
    • http://sungder.com/upload/lurufepebomorifotubage.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/58093571412.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/rajepexotaxe.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/rorebeviwem.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140769a4874f---fawuzujedovigik.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/botasupesisukoni.pdfIn PDF document text
    • http://talesma.com/E/file/motofusabud.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/33002011596.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/13626254941.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/74405516368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=react+usestyles+in+classPDF 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_off0000d5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 10260 bytes
SHA-256: 09687d8455c3a1e947fc7402165579d186a4b854ea28805b4c872f23885ba1fa
font_01_sfnt_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 15284 bytes
SHA-256: 86a64d2f5380c0559700d7c8265bcdf7c1f6facbe354efee9d77ddbfbc0c5e54
font_02_sfnt_off000113d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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