Malicious PDF — malware analysis report

Static analysis result for SHA-256 781bcb601123ab04…

MALICIOUS

PDF

74.6 KB Created: 2021-09-13 18:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef1e9639945969e01f19a6a0a0f85242 SHA-1: 1c6597c8ebf498881f144c7e05d00edcccf26272 SHA-256: 781bcb601123ab04b613c3749baccd6cd5a98c14cfc235861b52c49810c10643
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be hosted on compromised content management systems or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests the primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=where+do+i+find+settings+on+this+phone PDF link annotation
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/17116950498.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/51483646657.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/lepekupewirerorum.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/xineduzawopuzoxux.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396cbbbaa49---sawaduzexelemepororo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613009fd8ff80---nisav.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/80336676839.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/faxajaxewo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132ef460269c---sadowoburesuziwuvonus.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161396c57423ee---juzaxevisirimewofuxubolux.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/96418576474.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/68056215998.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0a817f881---sobapisa.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/88670897325.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/rumidevesirutofugubok.pdfIn PDF document text
    • http://888chji.com/userfiles/files/peludokikivuxe.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/19164978761.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/50796347275.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/29947391175.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/59064958542.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/pemoroza.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/jeboromizesexunikutipi.pdfIn PDF document text
    • http://inwestorfinanse.pl/userfiles/file/65106731826.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161326a31b63fc---60740727485.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_off0000c352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC352 10560 bytes
SHA-256: 1088a2335166766c37f12e73eb088ff86cedea265f04c2b0f390697fe083c490
font_01_sfnt_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 16180 bytes
SHA-256: 79984b3f5b39806015cae9f3691c9b6a4fe62d5c1d6e901ca74cf9dc43659ebd
font_02_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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