Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8e1ff0b6723f83…

MALICIOUS

PDF

91.3 KB Created: 2021-07-01 11:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 571992f65235b8ef669fdbaddf3e05c6 SHA-1: d602e30913025e668d98fb534fcac556c90201f3 SHA-256: 2d8e1ff0b6723f83433301deb0e298eaced6d4f170fbd8e020a0c4c76b27bdcc
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress uploads and other disposable hosting sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://ketchas.ru/uplcv?utm_term=guess+english+meaning PDF link annotation
    • http://smcertificationservices.com/userfiles/files/43470613135.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/61589159563.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e696d21f28---82299572427.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ba122d79---kajejarixediwuraferab.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb342d4af3---kebonevitinozomalub.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073b54b6b1a3---96259359641.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/67626561947.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d26fbc3df---fewepewujorejoxosibosag.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3d191043a---xamegugamukewozoderawafu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a29eab6383d---botenebo.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ffafc63e881a4020dbda1676c01ec52b/32511154334.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092185a42f3e---zuresamupowufe.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/xebafererazabawuxobolixir.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160908f7d68dae---56644105996.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bcfa46f5c---nexagupobubukil.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/wojefaruz.pdfIn PDF document text
    • http://chineseclothingonline.net/File/woragujokulodemapasobe.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/53678562694.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/8491051678.pdfIn PDF document text
    • http://goneviaggi.com/themes/userfiles//files/valug.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/fifapesinexu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbd284ab87---fuwedikofilosijogamixe.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e81cac883---59070015933.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 18180 bytes
SHA-256: ab37ee3e72576c1bdf978197a65ece299b0a496caee20a94f859a09edc9502b2
font_01_sfnt_off00011a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A25 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off00013031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13031 10376 bytes
SHA-256: d51b3ff660e41d059095cb0236ee2c28e325d59eb9a6deffcc5c3ded4c67178d
font_03_sfnt_off0001476a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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