Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38fa71dac6b4ff0…

MALICIOUS

PDF

89.9 KB Created: 2021-09-10 15:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 686d3952a90631d12ff57cc47387f485 SHA-1: ee9e6b6ac6b2fd41ab3091a921dbdfd5fcc0bfa3 SHA-256: a38fa71dac6b4ff0d9ec7761f3858cfca7991bdf7d15f4e983e3481338500368
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to multiple compromised WordPress sites and disposable hosting suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery. The PDF structure itself is also noted as having duplicate objects, which can sometimes be used to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://tidaksusah.com/contents/files/wetekarigikefixatiru.pdf In PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/tarapuzatirosagezaf.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/tobed.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/uptmjk95s36a0c4qm9uuuq9hv4/55234593696.pdfIn PDF document text
    • http://posuni.com/userfiles/file/1625769119.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/85440285586.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6a775af10246b3834271379cddf9b923/9862963879.pdfIn PDF document text
    • http://benrassam.com/uploads/files/retovarawizapeveg.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/punuwavagare.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613879c0c6a5e---vimodonisizenitujud.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/xiworofoto.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/21857977377.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/zuzex.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/kugubuvibazidiwumomedip.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905161806773796kfj5ua.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/86208781193.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613602e228a9c---77073419040.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/wetudujojiwimana.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210909020607_849927853.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/wapusisurosod.pdfIn PDF document text
    • https://zzhqhi.com/d/files/782345976.pdfIn PDF document text
    • http://skisun.it/userfiles/files/61736531674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ottimizzazione+ram+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_off0000fcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD5 10280 bytes
SHA-256: 9d464998986e3538a2f3e20bd455c6d9bf1eac559dc15572cd67a050bde01f7c
font_01_sfnt_off000113fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0C 17524 bytes
SHA-256: 22bd8d4e88082a5cf7b23711aec468ef7e63eea7a9f6ce87c841b75331e96995

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