Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02d0526bb000959…

MALICIOUS

PDF

94.4 KB Created: 2021-07-03 04:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ff99093cfb8e070cb232a769dabca7d8 SHA-1: 6228fbca6218e4c9acbc3f69b4f524e1dbc47877 SHA-256: b02d0526bb0009595a803672d169675c95de64ffef966bee951c26ab20be8d95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://saovietgroup.com/upload/FCK/file/77732577754.pdf In PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/wofago.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/g2pvm9saoj4jccdiiuhcnmufe6/sefalebesusokezerus.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160708834d3f9e---malin.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/50992502720.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99ea89d24---lisofazot.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/629c17d6f62c2627f53f2bcbd6bda381/nokugut.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/degaxidukulefori.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/18683517844.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/5cd6fac00be391353be139f5d1298af6/katozatosavesusu.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/9a436a3e8d971c0318bf17533a91c925/wotikebefo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608002b9f1770---59116219045.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/24545952269.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/sufutevazorusowepilik.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/d7a31fdb608647e850f30dfee8a0e85a/wodufegozilup.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160969cf322da9---refuredopalor.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/n4ofaq4deainkthdv5ekn7d8s1/87389935522.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0339077001620376442.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7b615737e9450264e265362158dd5bb9/fomuvozobolip.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/375d56eee922e5001691aab919036aaf/60253770864.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e198e77de---jixuzafesowamisovow.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/q31a7l9i7f9it1alm7b8ss4ps6/sozibuvo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075eeb698a32---31435758322.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/43997294561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=hybridization+of+s+in+h2so4PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_01_sfnt_off00010b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 17988 bytes
SHA-256: 88a1cce4230264f9be771d96b0c9c0ce6721fa0cc908df5c2a6ddb050446f96a
font_02_sfnt_off00013b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15331 10776 bytes
SHA-256: f7bb789c80b94a73d381e45bb41a2061f505554fc8f47addb4c5033b2eb1c076

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