Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7606f1d483b047…

MALICIOUS

PDF

86.1 KB Created: 2021-09-12 07:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57b8b852d998ec1a3a8d84f6902a2b10 SHA-1: f84099da6339ab63a12a57ff042764f2eb21c955 SHA-256: ea7606f1d483b0473e276dda5ea24248acb5b32f68e8fa3f9c3c65a1817cb229
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to other PDF files hosted on various domains. Heuristics indicate this is a link farm, with some URLs pointing to compromised CMS upload storage. The ML classifier also flagged this PDF as malicious, suggesting a high likelihood of malicious intent, such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/duzuvufokemixaxexaxim.pdf In PDF document text
    • http://phanmemerp.vn/attachment/files/molekup.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/37770495058.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/sujasavu.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/dabujatumuxujemir.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/xogenofukovase.pdfIn PDF document text
    • http://bronia.org/userfiles/file/13096804883.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/zufowasabe.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-12/20210912074638578842.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136fd1cb9e34---gagiruje.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/86047178581.pdfIn PDF document text
    • http://spharma.ua/files/file/wadutozojogeb.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/tuzoruzepukoxumo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613388eee8dd6---kubuwavixovarexuzuk.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/62019067168.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613017db82db4---gudixivagupinimoxibi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613086815a857---gakiminofewesavuwerux.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/wutebakeretukoze.pdfIn PDF document text
    • http://twilaw.com/files/files/84329732821.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/17439828336.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/gusukododasevizoru.pdfIn PDF document text
    • http://remobudostol.pl/pliki/lemizugodobuxujejopa.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/budujonijetew.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/buwopijowupevozapo.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/jerixavuwuma.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/zorixiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ff+apk+latest+version+downloadPDF 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_off0000eb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB20 17876 bytes
SHA-256: 9ee985f3680eeb6cca5d740c4134a7a09f8441c0ab8ae84d620dffd38c6cec74
font_01_sfnt_off000119cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 10712 bytes
SHA-256: 64dba70800abc50fcad5cf47ba9a0502b03e3fe50f1c0a18acd72b98b7ec79cb
font_02_sfnt_off00013291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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