Malicious PDF — malware analysis report

Static analysis result for SHA-256 c281a45e97658a22…

MALICIOUS

PDF

88.7 KB Created: 2021-07-13 21:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c146c7d004390a816549db4c7bb355d4 SHA-1: 8a4032c07550848525684b6a7ed62f9510d131d4 SHA-256: c281a45e97658a226d1915807a685ac5ebf16b633a501f2a51eb514bfa1b5b42
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple compromised WordPress upload directories. These links likely lead to further malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160905649872fb---97721722357.pdf In PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/vevorat.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/21467744746.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/dcbc8afa583debde31f4ba1534b028e6/13741144783.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/towibavubexuri.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/godiwifolinaxolaroro.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/nurobipelilu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b70e8e325c3---vibaf.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/9b148c5ad75899641529a16d407ae281/ravasupimufe.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/74103760204.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7555583d6---gigexubune.pdfIn PDF document text
    • http://gyobel.it/public/file/jolagurexipakag.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/jajuralewafaz.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/mixosubozopop.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/cf018bfb65e3f91c428acf77c8b3c103/52653898986.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/nafosozabaveb.pdfIn PDF document text
    • http://bronia.org/userfiles/file/17164395066.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/34167898924.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c302d6ca96f---33283157815.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d896fa4e3de---41389100592.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4d9038f4cbe5ac9a5c47739966a82c92/pufakeru.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8fd80beb8---34035356867.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/27969267138.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/39755176411.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/06/files/210628111204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=coc+th7+best+basePDF 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_off0000f9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CD 17140 bytes
SHA-256: e50623ad85b28e39ef600b517640631cda7f643081d16de09cab5f1dfbb9397d
font_02_sfnt_off00013e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E80 10208 bytes
SHA-256: 2300ae9fb99efca962b1aebe73e370a5642329a1c3c08eba2fc997b49db3b73d