Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40b06c56f1b0dee…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 12:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e99920c07d5e5783ba739638c66fd3f1 SHA-1: eb48d94ab04e42671abb49a05cc8a6937b92ec72 SHA-256: b40b06c56f1b0deeee328a53b439c5001c5b3e856bb4a907c76f78e4442680b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=how+to+reinstall+play+store+app PDF link annotation
    • https://derey.nl/app/webroot/files/userfiles/files/zulujobidakikolafadi.pdfIn PDF document text
    • https://ibericadearmerias.com/file/gojadeterarakubefil.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/ronapid.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/97209785062.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/muxovibenebepowewe.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/lulafemidefigasar.pdfIn PDF document text
    • https://pcetravel.com/files/file/vitowupigokekil.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143179414e49---91632792325.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/34280549647.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/27165320881.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ml35414o0c8mfqfq6pq3nd7ko2/95997140631.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/56484652500.pdfIn PDF document text
    • http://deforma.it/userfiles/files/jakukufexagogeza.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/kegoxos.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/jawulawezopijiziti.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/kiziwunene.pdfIn PDF document text
    • http://digifast.cz/userfiles/87462561758.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/misefipadawazavakosofigav.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384067c4a40---nabinamofimijajegabim.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/8708557451.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/sevamafu.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/84674466740.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d6d70cc09---68452727283.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/59180250845.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/fafamoluvapejor.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_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 10436 bytes
SHA-256: d9f06a4acc98b357ff048366c7107c749d7fc18827a328a67956d0e2fd49f7c9
font_01_sfnt_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 20576 bytes
SHA-256: e52f136cdec240f80919ff47358ba28291768ece47f8683ce1fffc73c7221caf
font_02_sfnt_off00012be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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