Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80865bc36ea0eeb…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 07:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d8ca13c21c7d455a47bc51e8e854e95b SHA-1: c0c03c91a6211d49fdaa7e64c9e1a28056a095fb SHA-256: f80865bc36ea0eebe1c1f89a27cf5121f9401a8f423d64b5484c504a650f631a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other domains, many of which host further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing second-stage malware. The document body is unreadable, but the heuristics and URLs confirm a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://elijasprojekts.lv/files/file/dozekojixa.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ef06c67d3---pupajigigovosofudamabunux.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/96229725571.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/batinatororovogexovove.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bacb83f9b7---9290364803.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161272aeac69e8---23880489342.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dc7b52376---femofurugojoxagerinozire.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-4/20210504033124919786.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/99328401661.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210816205916.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/85473290502.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/84051926821.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/zemoz.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/dcb60b76324bc78395d8e626254de8c2/kogogabowoxugiguri.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/waragakagevirare.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/rerar.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/vomukazemawe.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613187f059b11---gasumetafenefabose.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/93b992ef376a7fb3cfb08c5de60aa360/negonawokelos.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/cb57k4afbfsvgvp498r4c45lr0/46829063344.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/zerifepoxe.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/xibomikidifaleziwiz.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3653c99c25---ramonowowuzuvanebod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=simile+metaphor+and+personification+worksheet+with+answersPDF 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_off0000d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 17232 bytes
SHA-256: b4156d19c61c5d60c33ed165351aac471e1036530b2d96f205236fce8fd7549b
font_01_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 11140 bytes
SHA-256: 5153628230b5efdccffccc2373d8d1d92ec8eb015d04519cb6426400f36d64ec

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