Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18dfd4f50d13330…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 02:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e0e3484a6c16420e56f978ee7e894ba9 SHA-1: 989e4b4dce2d9ecddfd0f6e4fdda0bf06a94d7ab SHA-256: b18dfd4f50d13330feff7b07f2ccb7140db1ea46ac1ee3144bcea75f0fc1fa4e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/xusila.pdf In PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/5506708373.pdfIn PDF document text
    • http://spharma.ua/files/file/sabawibuvexenu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd673e32c5---biwixujop.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/16857278153.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/92978061324.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c81ccea54---lezitafi.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/5143625675.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/gijanerozarir.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/fudujomebolasibetinukidef.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210910071055_622v99.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133614f8244a---pukowewodisevaj.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/giloxexajuzutalonokuv.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/pufexotom.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/pumudaxoredukotidi.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/65218281387.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/zagubeliloxonadoje.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/85479616164.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16139c108e2498---27613344286.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/60596889788.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/pinowinasefizetap.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/39391661001.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/jarowugobazugutamojewitu.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/49914111791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+scan+a+qr+code+on+an+androidPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a5eb7c65b133bd78d4df6efbea0287ee/76506191906.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_off0000b2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C6 16960 bytes
SHA-256: 1dded903bf5e66128aed7f9f65604e525f2392526d41cbc574849e79f53b85e1
font_01_sfnt_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 10444 bytes
SHA-256: 65b1ed8e03abc9bb1225cf4f904bb2703b44b6ef8576ad549a56f821a619d549
font_02_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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