Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ea464c0c7bb8bc…

MALICIOUS

PDF

70.4 KB Created: 2021-10-02 17:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d17b45d8331da0eb15218dc58ba1b175 SHA-1: 02e81425209688f9be2e82749fd149c2e88450e2 SHA-256: d2ea464c0c7bb8bc22636fa9d370b6106c2ddad87feb5a82aabd493a6b816194
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains. These elements suggest the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://krisoc.ru/uplcv?utm_term=how+to+answer+what+impact+would+you+make+as+an+employee PDF link annotation
    • http://isotech.si/uporabnik/file/54078671749.pdfIn PDF document text
    • http://inistor.com/ufiles/files/92223954945.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615142fb272a6---luwina.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/barigalifefawenul.pdfIn PDF document text
    • http://klpa.net/userData/board/file/22858391380.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/23250304552.pdfIn PDF document text
    • http://khocabien.com/uploads/files/wubexisorafawikivedo.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/busotojonadopirajud.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/sakesonebewufawezutol.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/zaxapogojifufuxupegid.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/83444901736.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/nosuvutufowoza.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/81146606087.pdfIn PDF document text
    • http://sbkf.org/files/files/miwamudosinigup.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/rumaxebutimuw.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210929194529.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/78707940650.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091315093373499.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b40ddec48a---759122483.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/xadirobetubojamube.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/jupogirekose.pdfIn PDF document text
    • https://naves.cz/res/file/1598986538.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/damekulenibu.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/wukedu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6a08e11e5---24212072780.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/xufaje.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_off0000b0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E5 11160 bytes
SHA-256: fcdbb4e69c85ed1674af8ca1dc0f4d2763ba189d7a9c714a24f53498d69d29b9
font_01_sfnt_off0000cad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 15372 bytes
SHA-256: bb01f0242edaea58f9c164917680a9d173bd124e1067c63a608bbf2a537531df

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