Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8f23681e78afdd…

MALICIOUS

PDF

86.6 KB Created: 2021-07-07 06:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 356e350523bceab0e8702977380dcedf SHA-1: ef83bc13bb68083c7f3552efecc5502ecd3d01e9 SHA-256: bb8f23681e78afddd2c24f9fe3ad208df83f480e920e375241dc79e656ba33f4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm or phishing attempt. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests the primary purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/69fc2fea856fb3b73d60f29146c5a356/nokivivebutaz.pdf In PDF document text
    • http://dakhoanhanai.com/images/files/31628271854.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160709a0b81f82---90310371324.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/62336000896.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/8b4482a30a240310af7ef40c2c9b06a7/52039576319.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9585692ce3---64283962557.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/46627719096.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/712accdfcc5f38aea2eb9dffff1a7f90/givelix.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb6083a9e2---fetudepaxobureburuges.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/jilifugoletunepakana.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/5sd3h6uqutg8nmdbofqvsf308i/361433996.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972f2f01c93---16739494974.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/51cfa85de264b03810a4fc9257866c01/56015171463.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/gofesafan.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd180c2f2f---fuxobes.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0fe7ad7de1059536a2dfe0c4df95731f/714521978.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/jusikokuv.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e8ff434fa46467efbc2ea706990cd0db/fogekilodubikezifuwat.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/8a2q2eqami702db1j0kdd8uvo2/zutoperovafigonefubilamer.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/82556204418.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4398125e9---84846067190.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faccdd6959---lexobifaxigigewu.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a54a6f8b8---leterutuxasoziboguriwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=leap+chart+for+babiesPDF 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_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 17044 bytes
SHA-256: 2b8f163b86b60222f4b8cb123f15da8905afdf7dd473104c9d048cc08d16c5f5
font_02_sfnt_off0001355e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355E 10524 bytes
SHA-256: e78cb4382be9e5ec7471c73e920ab45bfb4a8ed15d508d259c380165662c2443

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