Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b1557f30fccc5e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 07:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3819aec1e1910ea2d24024a42c216ab7 SHA-1: 30828c81c067643790355de7120340cb3dc98618 SHA-256: d1b1557f30fccc5e403fd9e5ee1f9d4a94adfae92bc3ebce690e1d25de150932
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms or disposable domains. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=vn+video+editor+maker+mod PDF link annotation
    • http://eros-arena.name/eros/userfiles/file/4885672175.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/63303947661.pdfIn PDF document text
    • https://norservis.info/files/files/jobezafixogow.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a8de6fab9---xuwewodepo.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/bedoxebarupowezijudulomup.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/wetare.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/10a8d2aef676705e83738d6ded6cc7a4/36592534866.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/24775140734.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613467901a2d8---16050855263.pdfIn PDF document text
    • https://masukpt2.com/contents/files/wopaguragi.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/zinaniwavilefefodifaj.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/6908285061.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/86397307355.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/52849097241.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/14878472417.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134a22aa8c75---mewasebekelafub.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e9af2034fe89e6e2da4d3e5336eca9e4/tozaro.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24103082500.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/25901313961.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/6454728142.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/87706741196.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/minelat.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/37400555264.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/vilefoxolurumigexibidikug.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/gobinusadob.pdfIn PDF document text
    • http://esistore.com/userfiles/file/16694099676.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/12748136029.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_off0000c547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC547 10324 bytes
SHA-256: df79dae885e4ce3419246e1b1fc08b31434d5584c6f7e88359a7a6a25a52034d
font_01_sfnt_off0000dc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC89 16844 bytes
SHA-256: 3546fbc34099e52eaa91138fd56842ecf21be210270b3835f6e6f23a7c4b7fae
font_02_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1