Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d1d4aee10de95b…

MALICIOUS

PDF

85.4 KB Created: 2021-08-17 19:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 319d3ecd6274f915d9b283fc9c66bf22 SHA-1: 5a712e3113601ac740e2cfaca3411827f4ea0cf7 SHA-256: a1d1d4aee10de95b84595e068b60bdf27780a3d4e30a17857f4dfb5173ccc4ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The document body is unreadable, but the heuristic firings indicate a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=how+to+relax+mind+from+stress+meditation PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ee46d967---21344210756.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/xomivogisafipaxisami.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/gowebojugexixefewovo.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/legasujototerapunitivigo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a07bb89ee61---sagezozomof.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/99609420777.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/84873754489.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0d7271c8a7ef50e2e1d6073310e138d2/50374660860.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/203d2c09b8da2302a96e5e3ad5eb5eb4/zaxuf.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/52219045448.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077b2dd4180e---satabugesaxikuriv.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a326d9a0baf---54346107034.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfe8bd2de---63951547231.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/d15odqg3bf5bugali908kp0l91/20628214527.pdfIn PDF document text
    • http://mamam.by/upload/File/file/9563120767.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609612e248210---24212713390.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/279c989d36e74520bf5779d99800dd47/49988111028.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff86669a62---neruvinadevibivope.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/xurivimejijapejome.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c62ce16b88ef363eea1a067c29293d00/26835425341.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/27270267185.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qsbvct2mmvu3ar5muvuch4c7c0/wiwaguzadowup.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/sikipamurodudapupejores.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c22ac9c2a2d---53456542982.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_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 10692 bytes
SHA-256: 311860856a9eba21c39593093c92ffcb0cb1658c48628703b846ff2c16ec5985
font_01_sfnt_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 16844 bytes
SHA-256: 8cbaa6fbf786aabc2d657f8fa259d26c6e516ba55ef4c9a0c19499f56462906c
font_02_sfnt_off00012ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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