Malicious PDF — malware analysis report

Static analysis result for SHA-256 054fe181b7001b1d…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 03:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b02b64289fd79903c2dcb08f7ea47dba SHA-1: d82fd28903c0d813f280e1aed98c58838113bba6 SHA-256: 054fe181b7001b1d8b1f6452c5f71c5ff841bd29ecb51283f228354d055c9040
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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 http://word.mn/uploads/assets/50173500546.pdf
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/36690131082.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/bb8e65d5c7b1ee00fb076e0dc69be0ab/8235129550.pdf
    • https://sieuthigo.vn/upload/ck/files/32221406862.pdf
    • https://bitree.ru/ckfinder/userfiles/files/sukobovozogakek.pdf
    • https://gesema.com/UserFiles/file/daregibuxo.pdf
    • http://engcaphone.com/_UploadFile/Images/file/mirigo.pdf
    • http://sarljarry.com/userfiles/file/parudi.pdf
    • http://cw-cut.com/uploads/file/87841980404.pdf
    • http://alemotta.com/resources/original/file/palegowukases.pdf
    • https://cornerstonelaw.eu/userfiles/file/rijinupobal.pdf
    • http://koreaseowon.com/ckupload/files/vavokunugowazajujamurej.pdf
    • http://bhhangkhong.com/upload/images/files/nikudinapetuduwokesaboj.pdf
    • http://tayles.com/uploaded/24980814434.pdf
    • https://kaplaitalia.it/userfiles/files/83666442110.pdf
    • http://musikpark-live.de/userfiles/file/jexazegufunikovajaw.pdf
    • https://sainaudit.mn/File/xeledu.pdf
    • https://ixiu-23.com/uploads/files/202109171256419508.pdf
    • http://pmke.cz/pictures/files/94687645486.pdf
    • https://alutat.com/data/file/97003336291.pdf
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/39428733981.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329fec1bd45---kibejap.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614653575feed---nenapafanutajuginusajam.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/f7c3901a26e9c5051b782b754ca0f80d/gikarinasodenopopo.pdf
    • http://samuiluxurytravel.com/Uploads/file/bobijisu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+install+gyroscope+sensor+in+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 16792 bytes
font_01_sfnt_off0000f3dc.bin
25b7af078a2dbec53efda4b71072ca4bd835fdcff1941ef0bb17297b5732576f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 10880 bytes
font_02_sfnt_off00010cfc.bin
a95fc342c0b8753b266d94915f732ced15e9e06218cb0452c96a97a71cb8d305
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 22080 bytes