Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f53deac0d18fdc4…

MALICIOUS

PDF

84.8 KB Created: 2021-07-31 17:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 618dde7d112a165e64624e0ec91d0b8c SHA-1: 5fa49a17c94c4f21c2630707fc979ddd307f75fe SHA-256: 9f53deac0d18fdc450a9d3544b10b19b66b7c0038d364051886ef8a1ddf8b206
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. No scripts were extracted, but the presence of numerous external links and the 'link farm' heuristic strongly indicate a social engineering or redirection-based attack. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e5516042adf34ef7d82c914bc5e87d78/saragagor.pdf In PDF document text
    • http://www.parinet.fi/tiedostot/files/navazurakubazidituzifu.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/denereliboduginikokifufod.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/05b486525a6fd6f09f61c254a2621574/xujaladike.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aabd4448a5---81204746457.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/57953545556.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e2993050ebd91aec9d30b69a8b15a8eb/58660486355.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/fdccd3318c3064c7dcd0a43ccae94343/tonibuvefebides.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/pumijirevuzinelevoladum.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/fomigamexubabofufis.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14964e2d1---15553067480.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/iql58ssgjggmngm4v0tnh5ojn5/xejikamidon.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6918a141c---vupumajug.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf60bd2a2---10816577607.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/3806282145.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/36261864184.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/7652866345.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1248dd5b51---zizirufob.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d366c54b2---50077277239.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160982308b015e---xelelufurasuxukitux.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/55645193066.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/nexofubatiwegadav.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/zurixagugolerubazekuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=como+fazer+arvore+de+natal+no+little+alchemyPDF 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_off0000e4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 10844 bytes
SHA-256: 6d40c32014adce2d3f165bda5e666de952f511f6c9ebf914181b64eee700ae7f
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 18932 bytes
SHA-256: de072cd072ca89df267d3f6dd7ba3b63b055f5f2b64d4afc7e1aeda55b495de2