Malicious PDF — malware analysis report

Static analysis result for SHA-256 791d80abe8bc0697…

MALICIOUS

PDF

90.4 KB Created: 2021-08-16 08:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1af97250df9cc62e22050e94df76cd00 SHA-1: 45d2c80c97e871eb639d316eeec7ec6df795f474 SHA-256: 791d80abe8bc0697afb0fced2baaa07805bb1ab93e4fd13890eaf539ec9e6e89
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm strategy, with multiple URLs pointing to compromised WordPress sites and disposable hosting, designed to redirect users to download potentially unwanted software like APKs. The presence of external URIs and link farms suggests an attempt to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://aarogyamedico.com/userfiles/file/89573610849.pdf In PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/58734449556.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/21102546338.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/83199598983.pdfIn PDF document text
    • https://777mto.org/contents//files/11044215134.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/8bf5rts7dvkejg8e33hv59lobc/xinuv.pdfIn PDF document text
    • https://wagaskar.com/media/97320474732.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16075a78197ac4---88355882158.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609842de12961---72310450536.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a9b84f862---12637407426.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f697245a60---53639579186.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/zaguzagizujusolekibo.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/28575504839.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9445024af3---numem.pdfIn PDF document text
    • http://armanetti.com/images/67121552007.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2f91a989945e11ffba646409ca1643d3/midosiwuwiberi.pdfIn PDF document text
    • http://orthodoxnews.us/file/31885138352.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950a6775da4---87414445155.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/e24d79d771e673927cd1a3679bfae869/32620927756.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6263d566e4---13153046158.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/63113649294.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608683dc71d54---walaxegowuladus.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/26634332608.pdfIn PDF document text
    • https://inks.bg/userfiles/file/19534415843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=disney+magic+kingdom+mod+apk+2018+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_off0000f7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 11456 bytes
SHA-256: 4ef9611e0e4de663bf77e20dd9f79a6bac5dc44cb6a618d4b64229b8d4f70b50
font_01_sfnt_off000112f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F7 17852 bytes
SHA-256: 68cd339963adc428b6b351e743bc9745c5de965d23d934a39672fd3cb18143a5
font_02_sfnt_off0001415e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1