Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea113d70c2f2a94…

MALICIOUS

PDF

87.9 KB Created: 2021-07-03 21:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: dd9a31351f9aef73428d9c51ab8b4258 SHA-1: 9ba2f69115ab85d259c76d341f25c299015668e1 SHA-256: fea113d70c2f2a94950639c7afa2ad9a7cc92faa25b8202063d6ae9e69ea0982
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV signature and an ML classifier, indicating a phishing or trojan-like behavior. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The embedded URLs and the nature of the link farm strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://ventilatoryzlin.cz/images/file/setenedufasasuketizusen.pdf In PDF document text
    • http://btc-ltd.com/upload/file/kafofetusimiselu.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/17904939071.pdfIn PDF document text
    • https://tepihtrava.rs//files/ripewisukexejelo.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d08d18604---lebufegika.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/35687837928.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc08b0c20b---pomot.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/4d001e948fbbef863fff16990c6302ba/4937914224.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c5e22dedcc2597e3cfb9635e4a8eec04/4227318796.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb01b316c4---90319738373.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609712722ee91---duniwowolim.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/wiladizifetu.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/13039635864.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/wajanijigevevewuniwejofu.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b5ada8ac594f15c3e37cba70e7e71a26/17753682473.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2a3386e7382922b84300aeb0ee7cffd9/sojusizi.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6346a2cb2085599dfec6cdc5cd382c94/21040983347.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077c83e288be---80830362336.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/54242482990.pdfIn PDF document text
    • http://geniodelweb.com/file/84249907549.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e7112264a02c11aba7780956ffa37008/tejatasokunususazuke.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097361ce19df---tipixexozuzufusoxup.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/13fc5797f61a54c873400522fdcf8b84/vujefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=red+residence+hotel+kaohsiungPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 10888 bytes
SHA-256: 4f3a79fd4a741e167b02bbe4d1d13ab005d1723df41b3f49527fbfc0f36770e2
font_01_sfnt_off0000f86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86B 16988 bytes
SHA-256: 256ae49ec17eb9300599cbe6de9bd8f6ea66f38417c50c22e84dd83cb217f96e
font_02_sfnt_off00012417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 6176 bytes
SHA-256: af6ff09b56677f95d0563b0a4d61e1e70151c64ef7e1b2400d568270163a0906
font_03_sfnt_off000139a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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