Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87ab7d1854e09c4…

MALICIOUS

PDF

97.3 KB Created: 2021-09-20 21:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef9bed4e8512b52d20cb89110961e09a SHA-1: f090add4fa98b849a9b07be89501fcce6a7f19b2 SHA-256: e87ab7d1854e09c46ef500fd178dc21de393dffc44e9d5a7aa0f4812cc956f43
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly suggests malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document, likely used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=memory+leaks+android PDF link annotation
    • http://deforma.it/userfiles/files/40272475120.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af32ea991d---10682823626.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/11270375016.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/kipodufimaxefelazusukobex.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/4837695576.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364c244bf32---katekaritapepebajumiz.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109170816371868.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/56168213381.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d56caf92c---vonajasidorinusidumik.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ccca7086bf33500342978b2a7cccf079/67324616633.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/xerekejukorifipabezanaka.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/40377860507.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c55c909067150e2946c015a75cfc0be4/vajarasajarifaxed.pdfIn PDF document text
    • http://alltechsro.cz/files/70527653507.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20219554587878.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/zuruguja.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/melinir.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161328119e1442---40595857174.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135610119811.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/famarakasoxafimuf.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/jivofusixolivalani.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/vomopirusizapajezizuma.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/baxujebanomoweru.pdfIn PDF document text
    • http://indah-education.nl/userfiles/file/19382739403.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/88167362648.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_off000119ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EE 10508 bytes
SHA-256: f007952d3b3d8d18729c8043f29a0d2c7809d23127cab51c40196ade01902924
font_01_sfnt_off000131c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C5 17268 bytes
SHA-256: 27571ef478c38810bd52e2b08b320c6ace98fe73c7413065199a1b920bcdea72
font_02_sfnt_off00015f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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