Malicious PDF — malware analysis report

Static analysis result for SHA-256 6412f623a89a0a20…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 19:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8efedcfd790396daa12018c0b743a5aa SHA-1: 194adf114d233dd3476bfb2078db0b4e749bc2e7 SHA-256: 6412f623a89a0a203da223d00df378aa39a4e38fb98af3eb536f914d0f1c3be0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on compromised websites. This behavior is indicative of a link farm designed to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://weblative.com/wp-content/plugins/super-forms/uploads/php/files/o0k238no6mgmt8mivcdkt82vru/83688183214.pdf In PDF document text
    • http://visit-pune.com/userfiles/file/botujuxikesefesiwopitote.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/zusuguxuleloxexanozalo.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/wukakilejizujujozeg.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/vavatunuxisojanuri.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/letonul.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/54419656536.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c54cc7256---jozelumofozezixufajet.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/eae4bea4baf267b1d87d05eebdb14de3/lovevinokaxunimajus.pdfIn PDF document text
    • http://ihdbd.org/upload/files/nuvexotarox.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7uih41kv2c6uu48hq7h0sf5hc6/xogoguxojuwusosufi.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160985a0318544---dosofejoto.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610b673195e9c---tudulebinufekoworew.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/ferivefaroxuxogafo.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/290a77142b01b75de0195d47efc6e5a5/83377815416.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/17933601454.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/51266012595.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/79a510967d601e256e52818dff64b322/96429461030.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/57957845110.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/62425398768.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/34070069054.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/gumixuvilo.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096610b16f98---xaluratafudenanototuzalel.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/f0f9dbf9ecf1c01d3db7048500b24e19/jovosogenisuwedixefilujop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=wedding+cake+cutting+guide+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_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 16840 bytes
SHA-256: cbcb2db27b071df93966cb3c43f56db8e72a458818ecb10dafaebc281b12edfe
font_01_sfnt_off00010526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 10544 bytes
SHA-256: dbd1ef26ba69b30715053004acb2faf2bc862e6415f638b33371620cf53ebf6c
font_02_sfnt_off00011d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1