Malicious PDF — malware analysis report

Static analysis result for SHA-256 40796176acd48746…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 18:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2018266ddf8f02cda8dd75a00395450 SHA-1: 9a42e52a4d0e09591df4e95a7fca37954e807945 SHA-256: 40796176acd48746f434a1f835616722af2a430328b40073af2c9467f1e073f9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://anjilh.com/uploadfile/file///2021042909111625.pdf In PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/57648636027.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///85718565961.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810141478c6---44645645996.pdfIn PDF document text
    • http://oodow.cn/upload/file/2107220737421727513pm4p92zwsgg.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb10d981f5---84962731336.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1ac78a791---tedadekonepu.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/33615210089.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/nogunigeninarebik.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qdccjn9dlu9gjpr0n1i87bq88l/lidanojuxokomi.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160840b534cb64---jaluwujit.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210609100300_m5zfgf.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021070812371055.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7a702e6c---66809814800.pdfIn PDF document text
    • https://langumeistras.lt/i/File/28181897639.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/boburawafavaxipisa.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/893c7637f499fd377b56b82d32e8f794/7114679059.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/gibijamejefukikamebaf.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///bagobifivoraretaxupaz.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/025a2035b06dffd8563672821324e549/86929837916.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bc0a851ad3---29226941770.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/jelibafuwaligub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pr%C3%A9paration+physique+handball+pdfPDF 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_off0000dfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 11248 bytes
SHA-256: 9e3becac2c95dc4616ac15d152b55936c1f41940b61a7c95561249fac1957836
font_02_sfnt_off00011174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 19764 bytes
SHA-256: 7040e1e4a9916b6776e3e35c6c2a625a66b4ba2eaca35cf28484204e39dcbc61

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