Malicious PDF — malware analysis report

Static analysis result for SHA-256 de64a93890d7f4d8…

MALICIOUS

PDF

71.6 KB Created: 2021-09-29 10:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1ab871dbb315c92fc8bff06e1f7aa72a SHA-1: 201952ac1b63485e2fb889cb97543833a7f5ebb8 SHA-256: de64a93890d7f4d8b0efc5a4ea5c0abd3162447e15dcc9fb7b17cf6dc79a724c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external URLs, many hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=best+folder+hiding+app+for+android PDF link annotation
    • https://bouveau-consulting.com/userfiles/file/leduputidubovale.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/renazolasemeweso.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/supijame.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467b936821e---57305501535.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/weduxutomofarixirebep.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6960dcb50---xixedezinipa.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcaed23b09---66559766687.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161330e212b796---befeped.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/49387633188.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/10267774165.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/69945587802.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/tuvuxurasurokojapigadukos.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/nafomudojivitigiromo.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/53266353010.pdfIn PDF document text
    • http://pskov.agisinfo.ru/uploads/content/files/femajafinal.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210906030515.pdfIn PDF document text
    • https://coil.hk/upload/files/zolajim.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109091415294065.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/76918890713.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/5540991073.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161496499132f4---28898587419.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/xugobozizojejorubetib.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210923_E283ED5BBC46A53B.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/vadugatemeviwazul.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_off0000b3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B3 16456 bytes
SHA-256: dbf9dde23e8ec3c1851b2435040bf23a7916c31fed8f2a16a911722e18e59e0c
font_01_sfnt_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 10828 bytes
SHA-256: f0becdfcedab65a01e9bde4792e3518eaf3deadd644ad7b2ed12747210f59200
font_02_sfnt_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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