Malicious PDF — malware analysis report

Static analysis result for SHA-256 af98b5d7cbab0700…

MALICIOUS

PDF

320.4 KB Created: 2021-07-02 12:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 14a112cc9658ea90fdc1fc0e35a07c51 SHA-1: 4b7932d70c3c5f4988a86fef8a1d4173d59de0a7 SHA-256: af98b5d7cbab0700f8baec0cf63b14a7d7558382ec2dea683c6f003b5cbd6d7a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a phishing lure, specifically using a link farm to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a phishing attack that likely attempts to redirect the user to a malicious site to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081d31fcff10---papenamibumofewofu.pdf In PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084fe6527e90---vexexulojavumetokobabiwu.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/doxowatojilaburug.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/resezuvotarizuxosara.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a072799c5f4---binizejuzexaxizej.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160987eb70c030---mumulaw.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/90329387247.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a87cd6dbd---33528390984.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00cdb918b---raxakukokewupugimisituni.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/0a03b28d2a01b0c572ebc6aa72fe274b/99239401158.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/s1g4c9mjgakeh47d9ps0sjljje/zatolifevinilizejow.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/59g9eiu0igukhr6a8bacrg55gg/votinekupujuzanif.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/574bdcc5e841dba8a3c7a22f3062ae04/98625134980.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/ziluz.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/21415056442.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/duxafasadoxud.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/segirefekenivubetene.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/33459847372.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/diwuzexovowimi.pdfIn PDF document text
    • http://brmc.jp/user_data/userfiles/files/wumofenepebatis.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607450eb9a04e---40596138886.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/30948197e6bb4f7ae1bc07c7061b2e19/rewulitakunisakije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=worship+of+the+serpent+pdfPDF 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_off00048fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0004a816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A816 10380 bytes
SHA-256: 65f4ac218b27067b64e24e213d131bcf44b3a11812602cfcd68311735ec703ca
font_02_sfnt_off0004bf7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BF7C 20148 bytes
SHA-256: 8e4f91c83f06facdf0d44060121eaeecfe1e1649b589809e0f9b4ec9d3c6c2b5

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