Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dd9b4d855db088…

MALICIOUS

PDF

78.8 KB Created: 2021-07-13 23:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39d6be9845bc1592b602b697d3d90fd7 SHA-1: d6d1af4da8029224b4e409ae998f51155b6b0217 SHA-256: 41dd9b4d855db088ecaca217fb5de6713f78eb509e1ef25f74c409f2f800f68f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to compromised WordPress upload directories and disposable hosting domains, suggesting an attempt to lure users to malicious sites. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ucinnovation.ru/admin/ckfinder/userfiles/files/wizosunavax.pdf In PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/xepewawimabitawemaxujawek.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98be20789---72846376998.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a53006501f9---97709516756.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1626123061.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9c7da567c88cbb693249ea234ab3832d/44066599571.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8f55c20a---23205924922.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/fopezikemonilejozuteteloj.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c02873c3c68---78343354129.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce2c3a1448---53592048847.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d320c593641a0ed7aef1897b94fc49b9/dozevol.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ce4a417d7---91826169053.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160927aff79a52---luvapo.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a902db1acb---dapixikozomizopifep.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/3lgnhb3hm5jtngug2p307f11kf/vepuzudadomotunix.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/pufutubab.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ht570kgih4ng73hvkurdr8mhlh/butisenudijasabokudekawuv.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210608005333-62359100148.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/sanebawexinapebi.pdfIn PDF document text
    • https://bloomeng.com/uploads/54479481341.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/59110963792.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/40802100963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ecpe+book+1+answers+test+2PDF 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_off0000d0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D0 10700 bytes
SHA-256: a6e4a8fdf7b6286f4b0ddfe0747d9fc5d6f9c353f15dab0284050a7a458a4478
font_01_sfnt_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 17128 bytes
SHA-256: 3c2f7901d2f0338d921886c93874a5565f84a5046b681cc0ad7d38b9793afb56
font_02_sfnt_off0001163d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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