Malicious PDF — malware analysis report

Static analysis result for SHA-256 d487bffeeeb087be…

MALICIOUS

PDF

104.6 KB Created: 2021-07-14 02:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 28f6a0bc5f4fbe725b047d21ff68a3f8 SHA-1: 8a994458e3709016ead3f75c0df516f6a9f9572f SHA-256: d487bffeeeb087be3aff34cba76fb65c1598c6c3c8e29b4b6cdd11dabf4d5099
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://usaoxin.com/userfiles/2021-7/file/26265387202.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d722e5bb---41427284423.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/serekew.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21f168b547---mokizolurizoxivamosifedu.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/82976840237.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/2117634895.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8aaa76ba---ragevomeguzunegeminave.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a028812ff22---14728093503.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9135c2b0a---wegumusolorup.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2a4da400---wisosomajulafejotavev.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/dukefa.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/7cd6aa47634e72724e6a717cce48c590/52610094323.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f8fb7ba01---52768460005.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607c763444a15---32088507810.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/19337559230.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/06f48acaec4a1390cb1f61a20b70c93f/siwalugubutemabar.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b4313ec3ff973db0aed0a10c42eb05bc/mivopiguxifukigijunizi.pdfIn PDF document text
    • https://afayl.com/userfiles/file/guvixafojejumudusedi.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/bikakenudonetezuw.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/ct6of8kubk8pi5onr0c5kvhg36/93494772360.pdfIn PDF document text
    • http://rrr71.ru/upload_picture/weperarakaxusijefekovowe.pdfIn PDF document text
    • https://topaldanang.vn/uploads/image/files/fevodusapafotubi.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/nutedidesanoworolovepafiw.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/84270195446.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607581ffa44a2---zitemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=word+for+easy+to+get+along+withPDF 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_off00013274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13274 18384 bytes
SHA-256: b1ec7d31d39ba1ab8d877b384d1f4ad28d6a2844b801edb758e053ad643fc0df
font_01_sfnt_off000162b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162B6 10828 bytes
SHA-256: 5ec7418d7b7a960619c97f4044ef9529348fdb1608027b84f6d631e2c2d623c9
font_02_sfnt_off00017b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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