Malicious PDF — malware analysis report

Static analysis result for SHA-256 57feb9628f48f750…

MALICIOUS

PDF

83.2 KB Created: 2021-08-27 06:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44a4d7c56489f449078f74ca7b34d8d3 SHA-1: 376b5eeaa27ab7aca1316a0c36d9a8b409513fba SHA-256: 57feb9628f48f7505c20e1646f6ca6e2614751ffb6b94c4216e165bf065e1891
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, a common tactic for hosting malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16104c746e4079---41306285973.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0809750c2---jujokasab.pdf
    • http://suphammamnon.org/uploads/files/derazomakegefegem.pdf
    • http://huile-de-nigelle.info/userfiles/file/mipasuke.pdf
    • http://fixafilm.se/userfiles/file/mokugum.pdf
    • https://annjulieskarpmo.com/userfiles/file/34201360468.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/97e231c733fedaf337cd6409a7218c0c/51243605428.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/98571977307.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728ebe590fe---65701104002.pdf
    • http://thetuckerfamilyreunion.com/clients/67950/File/23611958906.pdf
    • http://tpdw.pl/userfiles/file/fuloninu.pdf
    • http://dgjinhak.kr/DATA/upload/files/202105270435537995.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cd562367a9a---zavuxomumoxorav.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b62de81e584---kawaleburotenaveluvuburu.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/djs4tcvvgpat80tnul4dgmcha5/kofovegu.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2ec182bcd3d3d792deb1d759565c651c/42710568267.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a637a4f74c---82135521805.pdf
    • http://kfnmsz.com/upfolder/e/files/20210823191613.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c120b1c55b7---2613913259.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/0a6ff5c03352ffc40771600f2150ae85/papuguviwawiw.pdf
    • https://greffedecheveux.center/upload/ckfinder/files/fevabadamaxeboteg.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd41f15b7c---40241719712.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ql833bearj7tlaclflevobgv37/63526548485.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/tokuz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=homeostasis+definition+physiology
    • 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_off0000e2e0.bin
b598025ffaa0adf17f21b0397f68ef6e7289290b677f9981da0aad21811770ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 10952 bytes
font_01_sfnt_off0000fbd8.bin
48907dd4feabb7da8bd57407a720062af3d78838687e4b38b187bb945d537875
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 16244 bytes
font_02_sfnt_off0001259a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1259A 16792 bytes