Malicious PDF — malware analysis report

Static analysis result for SHA-256 8521c6debd7f8d52…

MALICIOUS

PDF

114.9 KB Created: 2021-06-28 17:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c0b1a29ae1cf036416d955ea32d0cdcf SHA-1: 8edf590f86c5cdaecf96eef4e3d7f64624e246cd SHA-256: 8521c6debd7f8d52939cdba339395e0a381df1681fd8e3e390978efb812b6a7c
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites, as evidenced by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The embedded URLs, particularly those hosted on compromised WordPress sites, are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

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 http://haphadoor.com/upload/files/62788150869.pdf In PDF document text
    • http://primaneighbors.com/userimages/laxefenibepidum.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f4bce5f8c---rezaduku.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/kenikoxerojajupeb.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/vorakaxopexivizadud.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/kabemugegugedipivogukonot.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/69014379154.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950e4de6b7a---kasefavewidafufikulibo.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/14470320283.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec77316f84---13108466351.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/23483400303.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16097c132afb16---wakerefutodiliruzozaw.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb8e95ac9b---48599603987.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071b5bec1f7d---jekuman.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/da0ff88adaaeff314529c26ae1910677/mobotajulofalebegaxubuto.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/finodiluvoxopebadepepidi.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16098672b14a3e---91392931045.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ffacd9777---ribemanemoruruwoxu.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2488a74bfa36aefde30f4644c02bd87f/gelaserab.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afb960ce613---11433535256.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/2q06c307ib89g0g6936qvh9kv5/buzedavadapizime.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/e580fb3f022617a19e57d4590fb15d5c/zugirafawezapi.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607454dce43d0---5428210866.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d181c201d---84470035985.pdfIn PDF document text
    • http://ogbchurch.com/clients/880797/File/8095833392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=frivolous+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011162.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11162 27204 bytes
SHA-256: 311759c9ddaf89b53d19926c192a7927abfeec1844912434a5d328ce6d6b197c
font_00_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 10600 bytes
SHA-256: 2cfb2b7deee4b41f93dc7ec0246349d8e7425824111786ed2b7e13b38d1fa188
font_02_sfnt_off00014415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14415 30488 bytes
SHA-256: 8c7a0529ade10ae5588be0feac803c9dc16e1174d7ba087983c2ece8f8697156
font_03_sfnt_off0001898d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1898D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001a19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A19A 7936 bytes
SHA-256: e3e6a2df698f87f49c455bc7d3fb917c0db4fe7bd9fcd65d7b2ec0aae6820edb

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