Malicious PDF — malware analysis report

Static analysis result for SHA-256 a881d620adcffa8a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 22:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7aab35b2b13e2282020d344307796028 SHA-1: f0b7d6eaadbfdeed8e90514d36209fe1c8ad33ef SHA-256: a881d620adcffa8a3483246821423024b26afcb92c766454aac61133cd2e2a6c
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to other PDFs hosted on various websites, many of which appear to be compromised or disposable. This behavior is indicative of a link farm designed to lead users to phishing content or further malware downloads. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=cheesecake+factory+job+application+pdf PDF link annotation
    • https://romalasergroup.com/userfiles/files/9237338388.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/98730746595.pdfIn PDF document text
    • https://krossi.ru/images/content/files/31237453307.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cda65a83d---pizeb.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/69555481155.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/laresivokifasumel.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afe0a7e4b30---4142071893.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd105c6392---webepovelegenikik.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210829233610.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/vujowuxo.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/vujakevosajojuxarel.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070372977195---supabomediwodo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857058a38f0---68663998494.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bbd2c8bca---6300718688.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/fudezari.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/48422838869.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/18586625451.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161238a24defa6---82917395232.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/41289833896.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/dupulipifovabukobawisalo.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/nemawaliliwar.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160806c8ee3091---kofukonasiro.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/55004493947.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16070eb76523e8---potavuv.pdfIn PDF document text
    • 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_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 18704 bytes
SHA-256: 07e258055bce85cb44ab47978cb9432e9c114eecff5068eb29b63126f50fa094
font_01_sfnt_off00010fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 11224 bytes
SHA-256: 9eda71afc0bc69ffcf5d9be0a9de53761ab5ff392d5e8ddd804aaf30282b1016
font_02_sfnt_off000129e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.