Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0781653fb2a147…

MALICIOUS

PDF

83.9 KB Created: 2021-09-10 14:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 57e9a3c0cb67fa7472b139ffeb852347 SHA-1: b63cbad6f97f4847b3213e1cf302a839eb8f1fb7 SHA-256: 4f0781653fb2a14724ca3a4560ed72d6010662f79d93e884c8e94379c08ba5ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised websites, likely to facilitate the download of a secondary payload. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://ourconn.com/userfiles/file/202109031159023679.pdf In PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/55572063324.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/vurafimasu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130aef40d97e---pegufefotagilobubalojuxo.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/62a1ee568452427f6107fc3f13e6dd24/japunu.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/nakepoxojobidenezax.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/26756781613.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/silamafizujiwigi.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab76a8e0b4b77d199c65897b537b4a3d/63088685348.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/9618572085.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/39183671185.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613476e6af080---zonotakawinowokafeduw.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161323b68f3d16---65972694515.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/batoniju.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/69045246187.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613472c6b826d---besuwozamivagube.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090504571573499.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/30155689420.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/71068613742.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d0299c8d---10551520485.pdfIn PDF document text
    • http://methese.com/upload/files/zorejozeluvugebex.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613161a3245f4---62104621009.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/detawexijomofonepol.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/vusadugazotatixodijaxuf.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b030537fe87966c27efb3e40e4a289d1/batokepalurazale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=videobuddy+lite+free+fire+diamondsPDF link annotation
    • 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_off0000dfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C6 18984 bytes
SHA-256: 1aba7743c008f93c269e25856fc4d095c55a19b9845e71de777d287bf48cba45
font_02_sfnt_off0001289d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 10840 bytes
SHA-256: 98faecfb09642eb38c0f9ffcbaf8e46162186f138547328d9d755a31843cd76f

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