Malicious PDF — malware analysis report

Static analysis result for SHA-256 000356c51c567ed5…

MALICIOUS

PDF

72.2 KB Created: 2021-09-11 23:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eae4e8544597c23819538917e71bb2b6 SHA-1: 21dc8470a27d4841433088ef3b06c2c3a73b5b07 SHA-256: 000356c51c567ed5958e24a419f871d0618e9175b1fb3b282ea1e44866d620f7
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, not containing readable user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://alihuata.com/userfiles/file/rowedovuf.pdf In PDF document text
    • http://hrt-foto.hu/_user/file/jetefefufiwip.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a327c10f44---70761197628.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/80474191473.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e129d97e---tomevodomizakujilokaned.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613204ede234b---78747123445.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/62130531819.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/36410768717.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/tiguxivewufodamuvofik.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/doduvunenadofijajopobuwux.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/wunupoxar.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/9549710502.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210905190026.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/ruragifefakupewik.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/rofobewifazemobim.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/fusovonifedif.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4d420818b---gegozabiruwixibebojodas.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/41532688153.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/52d0f46bdca5eca430dbefd8d1187160/liluzaduxavog.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/18959148645.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2d9e9b24---pujotow.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/53686866052.pdfIn PDF document text
    • https://qkon.ca/images/file/zarus.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/44911639687.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/popurosav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=taptap+apk+download+pubgPDF 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_off0000baac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAC 15976 bytes
SHA-256: 08510bbd38d65f0adca1a49f90e82f58fea53abf96e9d79eff3e1378e837fbff
font_01_sfnt_off0000e349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 10456 bytes
SHA-256: 85851e5a043aa13348c053f4c1d840c6b50ffd79d378a057ce65b1a04b01d415

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