Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd13ef8ff08fb52…

MALICIOUS

PDF

69.1 KB Created: 2021-10-04 05:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26e53139876bb27140864124b8646289 SHA-1: ecae73ab498edd5a19746497171bfbf7ff5d989a SHA-256: 1cd13ef8ff08fb52930020d351bbefa79ce1386da99f4fb83e4d3d4805359426
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories or disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://chcial.ru/uplcv?utm_term=signing+naturally+unit+2.4+answers PDF link annotation
    • http://carsonpokebar.com/uploads/files/vasifanemibi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159417e6af2c---rubilukitarijotumop.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/36220060292.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/783848636.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/12742616777.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161506b2d5e1c1---puxetefazepokawapoxo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/091b497c76723e9197ac50137023cba7/taderuneponotivewiritiwi.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/58084324212.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/vabogitanuj.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/pudatapaxenuvesaxaxupa.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/satiwusojigotejuno.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/sojelagokumibitoxonaja.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/10465958035.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/dulex.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/97812817004.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/koriribumanakisonizenu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159c8c0719d9---87643575579.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/nezaguzusodetit.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/77395413241.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/jumefipivuvadovowowomor.pdfIn PDF document text
    • https://eguiders.com/uploads/17602690773.pdfIn PDF document text
    • https://ubranni.com/uploader/files/66278781677.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/nezisinegijadobugava.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/55713691983.pdfIn PDF document text
    • 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_off0000af47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF47 10804 bytes
SHA-256: 3c3ec7f1ab3dba829a2925bdf28f8ac9c131c2452886675f758c6c6f5559f609
font_01_sfnt_off0000c876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC876 14768 bytes
SHA-256: d1030b3b30c8d787c650cf020c04d40230909ed9ed343f76d2592d0420d5c2f8
font_02_sfnt_off0000ecde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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