Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bded7a910cc374c…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 15:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7960eb0ee2dbceb8c53fb5eb8f0f5762 SHA-1: dcd56762dd71dd9b6990760dd27985fa9dc457d7 SHA-256: 5bded7a910cc374ca92fb77b1ed41ec0f4e34301ab5999325f2ac4f4036ec619
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests that some links point to compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://queure.ru/uplcv?utm_term=pixaloop+unlocked+apk PDF link annotation
    • https://brincandoeaprendendo.com/fotosempresa/files/7482701647.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/40037556840.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e68850d68---niwodinapurudorajofadoje.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210917_F14F5BC1772B77C0.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/setefapetifijale.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/89049970821.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/mosamalujuvotelupe.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/83752819690.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/dawuvonijuzudif.pdfIn PDF document text
    • https://majubesar.org/contents/files/8738268951.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109161159513861.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/50009246078.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/muzamigaxu.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/bik9dtg7ofqprlvt1sls3ldf6s/lazezabatete.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/womadadimerugisovipixux.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/74149604180.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/44757061441.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/35686206140.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/91023795273.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/313c7d9e650f09a55dfb2892552ca06a/sosutimetijajubo.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/69105894574.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/molutawu.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/4188831520.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/xujare.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/xumobitiluteditaru.pdfIn PDF document text
    • http://wohingltd.com/userfiles/dukexo.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_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 10436 bytes
SHA-256: 3d570b11b6b7f604101de37b0b3a9f9108c5e7967c13139b8ee429d043cb128f
font_01_sfnt_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 18532 bytes
SHA-256: bf5936b10e2104b2b448d1f068e6e1c8e812356fa3ac1d506143a7f619135867
font_02_sfnt_off000130c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1