Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8bcfc7c5e8d7d0…

MALICIOUS

PDF

86.1 KB Created: 2021-08-02 19:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3b7ba6d065ef961fb32109cb90d60294 SHA-1: 3f9a02849df7e3207c99ee7d097edecfb803dbf0 SHA-256: 6a8bcfc7c5e8d7d08cb9833b35ddeb8c1accd73904312a74176e1177db194cb5
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised CMS upload directories. This suggests an attempt to lure users to potentially malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://kawanmto.net/contents//files/78405099724.pdf In PDF document text
    • https://abofahed.com/userfiles/file/36706968521.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/41196434092.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5974e78566---34594720377.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/37733746280.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/ronir.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/nirurejorawuz.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1e9ab075249c203fc3ae5932766f6594/jemurinutakazadafevujumo.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/20626264188.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/werelurajoxigixas.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/51643917826.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4ea42a9c0a1b807bee77ff7dce4fe207/vufesimozovuvem.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcb6389461---75241444488.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/6830072496.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/5c473e7a6e96dff5fd8a44422607ceb2/xolidanorir.pdfIn PDF document text
    • https://hirurgija.me//files/51116787702.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/84799774228.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/ziwijutomoza.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94814173720.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/tumawamepokubigonavul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+are+some+nursing+research+topicsPDF 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_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 10868 bytes
SHA-256: 7e8d91ce88a636f1bc7194f6f4f8a920625636703baff193c7073d0b1dee1618
font_01_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCE 17052 bytes
SHA-256: 4d2a6d72fb83cfae530f034507f4f115f2fdfd02b5ba10519e5ff86087793d34