Malicious PDF — malware analysis report

Static analysis result for SHA-256 71041c50ec4fe77d…

MALICIOUS

PDF

89.4 KB Created: 2021-07-13 01:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e91e102f896bb3ad8899152c1cf9c46c SHA-1: e68adcfa4f236342c8e8a9211f6975aa29021933 SHA-256: 71041c50ec4fe77d086d08f03d183bdd8bbb99ea8d85d3f19ab030c5d7738e80
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and a high number of links indicates a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dcb709753---21841119568.pdf In PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/kulezipi.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/4233664819.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd6edd6553---dedekitipomelevuvominosal.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/65119909465.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/j7badgskbscgckvogii0675tm4/selobajafumijufibiwobuka.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/jexuxoximajaboma.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ijob9l629chgr6vv0r9fgnb992/silikibosazoneve.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/67689364486.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/838f2b207155bc89ee5e5ac714b67d12/doronozen.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cbfb1dca0---62979793056.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/85860626838.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19254350d3---damofuj.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/kogovugubixu.pdfIn PDF document text
    • http://uamarkets.com/images/file/gojabosulalij.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbd77275a3---wutokazufofofuzig.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e9b0b52fc---31628165042.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/67347838082.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/5372665292.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e771142bd65---58410972862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=4+swords+of+justice+pokemonPDF 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_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 17116 bytes
SHA-256: b26308cf4a7fdd38532d3f43159473efdb6febf17e3f1e4343e851c074cedf1f
font_01_sfnt_off00012581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D98 10960 bytes
SHA-256: 7dacb3f6daf373564e81a137c8678b2d4754d587775f0ede93e3a5446d023392

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