Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ac403f1ee15b56…

MALICIOUS

PDF

89.4 KB Created: 2021-07-17 23:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f18e4f4cb02c72d5485c495f66420693 SHA-1: 4ae566d30e4a3bff47fda3c19c3d48cfe3afbaa3 SHA-256: d7ac403f1ee15b569c1e1ae714e73b1f45dbf6b041840871fcba63bda1a9bf24
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://fotobolfestmeny.hu/mvc/userfiles/file/fusixedososipizitafaliro.pdf In PDF document text
    • https://associazionedynamica.it/uploads/file/36411207993.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/xufanotukexalubokefusikom.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/2e33812d71a1363a9efaa54227b82f74/sigogesuletojudoboxixowut.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/21899981357.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/radizulotolufuvil.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6ddc5805---mubosisefuxa.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/2204691336.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/jaludiremoke.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e08009bbb---35178258181.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/34422988985.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608b32fd098e7---buzupofoloneke.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/mosabazo.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5a62b955f---gekoxupisusipabagamu.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89979622935.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bae5e3429---81591913621.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210716_0BDF1C4BACC8EB32.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c8faa337b---woxaxinojekefajakugejun.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c39532da2ad---66790985695.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/hj34lkv10jpvda27jv47ml98u2/38425799932.pdfIn PDF document text
    • https://mvservice.it/file/87364674116.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f85fb6421---lasovanumelivaseximalu.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/464960709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=oreo+apk+for+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000107da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x107DA 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off0000db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 17160 bytes
SHA-256: e3d976ef6673988f07b0293216f8dac24f2a9025a524ab7ccd861d15af4c0438
font_02_sfnt_off00011dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC1 2300 bytes
SHA-256: 8fa6055a1f74ef678f89ed35af33379089ec5aa965f282ca5a8821522ab12714
font_03_sfnt_off00012805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001401c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401C 10296 bytes
SHA-256: 810e51f00211bbb6c55a517f064ada5630e65c1607ab56e61464020fa4e822df

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