Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b23ac4343ce5927…

MALICIOUS

PDF

68.5 KB Created: 2021-09-19 04:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 69ad7ac5fbb2dc7e5abfd77259c97a18 SHA-1: 961458224ef59f3b8f50165637f088c26ec41898 SHA-256: 8b23ac4343ce5927be484d060ea090a4f9d2b38c7eecdd559931201c018690c9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=hiking+emoji+android PDF link annotation
    • http://3bbb.fr/ckeditor/upload/files/mopapuxavimowekiwekala.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/xekejexurofakuto.pdfIn PDF document text
    • http://bubb.cn/up_file/file/45902072846.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/90569021661.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/16873116314.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/zevogemajatiwakisipa.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/rasifipike.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/zabofowu.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/84555256319.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/zaxunapakikizotuf.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/9593418492.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161345b435e0b8---1652441528.pdfIn PDF document text
    • http://zeci.nl/im/image/mumajeresujoturomome.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/49861036789.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/denikitumavederovar.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613371b9c34b0---momijivotopav.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161434c58ea429---16036807417.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ec2bc5ff7---47906747632.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/22357883980.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/menanex.pdfIn PDF document text
    • http://getdol.com/page_data/file/givufap.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/wofodonen.pdfIn PDF document text
    • http://symbolfoods.com/files/file///latafelefokugutore.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/75291196792.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_off0000b197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB197 14352 bytes
SHA-256: 959fd2746a0cec7f65480927331b79c4aac3bb939a247f14bc5ffbd2f02ec675
font_01_sfnt_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 10492 bytes
SHA-256: 9cc01cf445009a1e471a07f1df1c2a343b29c3f3d24ff9cb45e2555c0f5d48b5
font_02_sfnt_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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