Malicious PDF — malware analysis report

Static analysis result for SHA-256 85796f3274af0f4e…

MALICIOUS

PDF

78.9 KB Created: 2021-09-08 08:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ba6e4cc014595de3b49b20a7551516fd SHA-1: 284690a0a7d8232bd0d3edf99df7c83e41caf589 SHA-256: 85796f3274af0f4ea8d0c05040165283995db3f44c79aa7d81c0aa9bfd8d8df4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage and disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.deewanalarab.com/up_imgs/wiledosudajubiwa.pdf In PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b377722bb---53050100056.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/xiwetumeragawa.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/36727043161.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608db827c5edd---gulawuzaramewe.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/wirup.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/1b0e59dbefe27d15e96c7e117db62fba/jopebajokugawuxoluwipifaj.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4d98abc1c---50372136111.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b98381f6e752f420425cc4f37d734533/66867328526.pdfIn PDF document text
    • https://senhewood.com/d/files/16639312489.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/71576656953.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094840e8d2f3---kumawuzugozot.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ko2fjplbomqq69h9vnoaks3bq2/nopusute.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/86939432747.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/xolixuxinenuralavusupe.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/95530410844.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/86343968630.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fd59f56530539a34c62d1bdc9ebbd1a9/kivemefujaf.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/vimefoj.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/sibalazumeburow.pdfIn PDF document text
    • http://linza-market.ru/upload/files/memaxomasizutenuvevok.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16121c0cfad29d---pekovobikifoni.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/29562986924.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa925f29e1---72739791733.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/86493217015.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/bumakisinivomupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=la+percepcion+sensorial+harvey+richard+schiffman+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_off0000ccad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 18188 bytes
SHA-256: 50f61058551c17064a8ff163d2fe318ca7949390046fce4bd892f2a3388352da
font_02_sfnt_off00011430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11430 10924 bytes
SHA-256: f809d213a5b1f83c3db18c2f6192599fe66b518141a21bc377775b8ca48ab1cc