Malicious PDF — malware analysis report

Static analysis result for SHA-256 1684512cb2dde84e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 10:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d75586a73e368c4d220846b7ff015399 SHA-1: 4eff6c3296db6308877fe16b37320133059ef78f SHA-256: 1684512cb2dde84e0df69b1100f7d71aeb29e540d7ea19239fae2af65b3298b3
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The malformed stream length heuristic and ML classifier further indicate malicious intent. While no scripts were directly extracted, the structure and heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/9ulk7a7q5cm8ubt49fktch5ac2/kenudosa.pdf In PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ee09023d6e88738d0f7166d53e971325/zijuzuf.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f05611ab5---meneruvazegukimiwik.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3408b5e2140cead47254d8518d0a073b/72368877824.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/zodefatoriwazeboxuze.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/72739006388.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/gesawonoxi.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c36ebc3d4c2---9036132558.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c522ed0321---7868662034.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/43400589331.pdfIn PDF document text
    • http://pneusmarene.it/images/file/14391440341.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/madek.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161293573c8e1d---33229674339.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba80eb23eb1---56986108920.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/796dqc0d6nrcut65hu2unvk72f/vunamorisi.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/33808428441.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/fb4b12be0ed520258db67c2f94e9cb0d/70134826307.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d4841c5fdf62509e19604d9a385833f1/nazabub.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4fd895ba322ba6dd8839b57adcc7d82f/sinetakuxawi.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d3ba67872---63174600007.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/41812507402.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/89932836779.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/vaxexam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=calculadora+cientifica+casio+fx-570ms+manualPDF 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_off0000caec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 11212 bytes
SHA-256: 85efbc8fa6761cddfb2f2404a21c16c55cb99b71017e918d672da80ffe284d10
font_02_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 18880 bytes
SHA-256: 411af4f143e7196b4fd8ff0b3f94f3ce90d73d77626281b7a61f9f3a3e2d15be

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