Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac14a1d717f06607…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 02:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05f9294d79ef72b8ee5c0cf7799fb7f7 SHA-1: 662f791740b8088f66098613e350cd6741e3cf0b SHA-256: ac14a1d717f066074ece0036389a295f5b05dc213925c3fa26d362a7a5395fb0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drsuthichai.com/userfiles/files/52639668000.pdf In PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b942c1924b5199c53a0f6ef6fffbb781/nubinigak.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/84008635081.pdfIn PDF document text
    • http://didula.com/img/file/wiparimit.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/zikaz.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/mekobunidi.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/32554533467.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/kaban.pdfIn PDF document text
    • http://retailcop.ca/files/zipadavegeripenipegas.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/wegenewedadobozumisip.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8143af784---74802843635.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f02fd70096170553710f1cad0e8e03ac/75104259213.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/52838230772.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/91883414342.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/85613862065.pdfIn PDF document text
    • http://akademibt.com/resimler/files/78619186386.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/vesevabufivugebile.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/6148655946.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/17715390548.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/87445224747.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f331ede475---konatuterogowukasuxusof.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/16812792048.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c5c8c38cd---47693766154.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210904223513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=numerical+mathematics+and+computing+7th+edition+pdfPDF 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_off0000cd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53E 17960 bytes
SHA-256: 62e6ea97372f9f7d8f16dc58b902a483b8dc4742f22a1508d0856329d138e942
font_02_sfnt_off000113c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C3 11192 bytes
SHA-256: 40972b52c26dd1e31685aaf03805994183e6923883e8e22530ff9f54e75dabcb

Open this report in the interactive analyzer, or submit your own file for analysis.