Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e3168de201a6e1…

MALICIOUS

PDF

87.4 KB Created: 2021-09-20 23:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0b4176129d2a91c3e8f0936bd9235aa SHA-1: 220a206e8f12eed8521543a0123ceb454d87bd03 SHA-256: f8e3168de201a6e1a61bfdff7b67b9ecb1209164f3c3cf4dbb8ab4d44c11a41a
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kristinanamaste.eu/files/dixawuvaf.pdf In PDF document text
    • http://dogoxuavanay.vn/uploads/files/37343936202.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109101322097405.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/141051235639.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/53239815508.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161465db2740d3---35677176729.pdfIn PDF document text
    • http://roberthalasz.eu/uploads/file/42412437358.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/kexokirusikivisev.pdfIn PDF document text
    • http://shamayachts.com/upload/file/rivekefafoloborepipetapat.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210908123828.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1887a7b3---fezejowuferofajezi.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109182221165775.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436ab8073ae---jemukaxavotusapazire.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349cb319e5b---tadonetimapedifuba.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/47271987746.pdfIn PDF document text
    • http://rideco.hu/upload/file/86667396512.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/jagegifusiruwat.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/45183247234.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210919160031_l1xp8d.pdfIn PDF document text
    • http://el-tall.pl/pics/file/72587785962.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/xunoxuxefedurowopas.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/dejajudowan.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/8231104783.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/xuriz.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/20226423023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+gta+5+android+apk+no+verificationPDF 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_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 11008 bytes
SHA-256: a770c549b492ff09078f9838f592fd0228a59bc11b1cc7377c78c5087239d6cd
font_01_sfnt_off00010ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB0 17456 bytes
SHA-256: 65d43d6687a02ccd8978a23bb116c89be273fe556ce14d03dc43f9b12375305b
font_02_sfnt_off00013762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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