Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b47a6826b2ef862…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 01:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb3c64dc46b894fcc48f99153fda85aa SHA-1: e6060436d27e94078ba950d036a2ecb3fc305e56 SHA-256: 1b47a6826b2ef8620856c9e42f041190aa49b64caa573bfa6f1dc0b1b97f357e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://ketchas.ru/uplcv?utm_term=zoom+h1n+manual+deutsch PDF link annotation
    • http://abcbyspu.net/ckfinder/images_store/files/76382128445.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/8312811162.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/92656801279.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/49977142085.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/rexesivaperosadutekajup.pdfIn PDF document text
    • https://stopserv.ru/files/file/vubaj.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa81c16d6a---veroxepiwomefulimuzivevo.pdfIn PDF document text
    • https://udruga-invalida.hr/files/newuvikuzup.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/15437826729.pdfIn PDF document text
    • http://chongros.com/userData/board/file/tikixit.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/235d8ed1d722478465170b17b72931c3/libupeletotorinuroki.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4b0bdc8d1---67407486900.pdfIn PDF document text
    • http://koala-al.com/d/files/wugejudefolorifigixen.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/feguwusokogufiz.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j9ra026eutll831akhll6h21a0/40920181217.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210803/21080319420213646410f0gr0com75.pdfIn PDF document text
    • https://oferta.lt/i/File/43751444979.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/45427437344.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1611aea8b5322f---bobetufixu.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/78664092577.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/98878445314.pdfIn PDF document text
    • http://polipack.ru/content/file/75637438496.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/5hltefcbfj91qfgcb5272ml4r7/3735197320.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/36932415682.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_off0000c1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 17560 bytes
SHA-256: fe5b12bcf5af299d86159b5083655dc3037e785c0a27339b7d8de834c82eecc0
font_02_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 10560 bytes
SHA-256: 4c0ade00027f43a9e676d11f44079901876def54000037353907249a397ce259