Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16739581dd3a5f7…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 05:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 10f57863613322786b3132e9696238f9 SHA-1: 5169b421e16d4433e9fbc39d1761c0146162c4b5 SHA-256: e16739581dd3a5f7b8e54d7b6f23b7cc84fd2625b28b9e6d4bcbf5c0630042d2
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 domains identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it's designed 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://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/xoremirixuju.pdf In PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/42916233133.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/i0k01icsfcbbi3ud6junu1bjs1/26816660591.pdfIn PDF document text
    • http://chinalabware.net/d/files/sijini.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/pitudanitinegaduwuzukug.pdfIn PDF document text
    • http://www.ezmoving.com/file/74751609829.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e48776188e---91013158951.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/wujitadizexetidog.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/04548b3720f9daf376b929d014de9afb/galajorudewavapebur.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/guveb.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/zudojinidaxotumepofuk.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/996408833.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/rijabopogejebojute.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/45f3ea5dee4aae984e0fcc4d98011e06/20234594021.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/f226ed5b844a2f501190a62fb63845a3/34860230768.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092b87e08d48---dowozitubuvoma.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/xafaxetigemowirurogo.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/15196337305.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8708db1b83---nadonewixonu.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/09c11b7eb758f45550674aa8b79e0daa/binelimu.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210704205728.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c46ee7eb78---xilimix.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/tebotedeposor.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/89429602264.pdfIn PDF document text
    • https://fasaac.org/temp//files/xekekapatofuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=first+ionization+energy+meaningPDF 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_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 10556 bytes
SHA-256: a5fe19858faa748617cd25770cebcba7713e6c81e2d2bd57d07641b999d97240
font_01_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 17336 bytes
SHA-256: 8872cfd2c852d0b2a16ddccf253eb0d370739282ef2cb8648798cb4646faa052
font_02_sfnt_off0001242c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1