Malicious PDF — malware analysis report

Static analysis result for SHA-256 651cf7a63e0a8b01…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 01:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6f37de57f735f856b10f11d85963347b SHA-1: 46f7cafe68bab2e56b67b02bad060e29c9fd6562 SHA-256: 651cf7a63e0a8b016f7f453d8de7270d6e0c8671add964ccac2799c7c39f13ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://le-bouquet.be/userfiles/files/bupeligejenodutif.pdf In PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/kuwufafegigepigegowej.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/vakumawedusevuj.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/22626666801.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/19274731991.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/82198718363.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/36262584006.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/2897735800.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/genanegikokalimaxunane.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161409cd7dec3d---memukebedoviniravovafeti.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e05b73e60c1920ce8768fea3096e7ee2/wagutodova.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/zipujelivewu.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/51248133867.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/zonubotabilarejanuz.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16141d372ed384---taxipebixelaxugetesik.pdfIn PDF document text
    • https://atrax.hr/files/70489837613.pdfIn PDF document text
    • https://sergiomauri.com/images/file/disozegedabofedajafod.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/xejojiwomibutonaxiwefak.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/voxit.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/868714499.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/60921837604.pdfIn PDF document text
    • https://kimcert.net/E/file/42139879860.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210909175513.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/22436857423.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/taxikemepitopajudabaxivux.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/lidikarisotifilodoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=como+aprender+a+programar+en+android+studioPDF 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_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 10820 bytes
SHA-256: c75a4671f35e5859cf2f2c1c754f5cac760c20e85b53f0ca8b938fd9949741b6
font_01_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 19820 bytes
SHA-256: 91467ab143c15c784f5c0ff2bbb0cda0cffd6786753f8de53b8cfa7bccf8b18c
font_02_sfnt_off000128f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1