Malicious PDF — malware analysis report

Static analysis result for SHA-256 03db08113aae388f…

MALICIOUS

PDF

69.1 KB Created: 2021-09-07 06:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c52772031be756305a93edbe17e6a00e SHA-1: 79686c8d24d4219031b357d67b376c0e7c4e292c SHA-256: 03db08113aae388f21f20973c5157cdc0d6631817d4c46f492219e9e34274059
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as a phishing lure due to its image-only content and embedded clickable links. It leverages a compromised CMS upload link and a link farm on disposable hosting, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ascinfratech.com/clientprojects/trading/file/sidemu.pdf In PDF document text
    • https://incoyun.com/calisma2/files/uploads/rinovitakopenus.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/tajijozuwisi.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f86900fe0---81536207391.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/nuzarizonozozekimazikako.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9ea92aaa9---52937568518.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/valutudaxiluxaxateladexa.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/71493321100.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/316735977.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/87781603486.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/24592057554.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/96r9dgvqflamki214btf0n0ge2/81270498173.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/tubemenujo.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/62021917577.pdfIn PDF document text
    • http://aurora-c.jp/files/files/26861497111.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/golom.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/tufonemigafemujutuda.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/zuturajovod.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/dofewerufujadafikunadi.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88a112fe3c---ligaditoras.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/38qo19s5e3aui5d79tk8h1bgb5/jepasuf.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/j27hcl3jcln5tn4knqitp1j3fd/fazorapemi.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/18811209402.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/gonirunugidurabemirim.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/xopuwozomuxuda.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/zegalefarovejomeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=alchemically+stoned+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_off0000b2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E0 13888 bytes
SHA-256: cdc866dae9b58e2e9503ba1a9c62d7687bf581665e01d2692488b671c66a8672
font_01_sfnt_off0000d55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 10880 bytes
SHA-256: 09c9399b8c1f99db4073de02393419e3b1092dcc703ff7443c04645536eb6c27