Malicious PDF — malware analysis report

Static analysis result for SHA-256 79191ce643590704…

MALICIOUS

PDF

76.0 KB Created: 2021-09-15 20:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7d6b0dd4dd9acebae6571ed8820eb97 SHA-1: ada564bc65c9759759ec8c4ab7de3e21cc05c6f4 SHA-256: 79191ce6435907048672a2a656bf2ff365cde0b2e85615b51595f529bea1b2b1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://atpl.aero/ckfinder/userfiles/files/19026029436.pdf In PDF document text
    • http://kamakuralosgatos.com/uploads/files/bexodomed.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161358b4c698c5---fakiboputotuvujov.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/50940517359.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/12692367544.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/64292673925.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/14595503741.pdfIn PDF document text
    • http://acelybio.com/upload/files/24441327062.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/46a0fc7fa38e85c0bc719b12d03490c1/10567383619.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/wexokegibuwomulalu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed589ea643---34096708339.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/88346947718.pdfIn PDF document text
    • http://nemochem.cn/upload/files/sodepek.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/xedajuvurepanuruwe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a54036d28---nibiw.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/lamuv.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/p2vkh7r8389vrsii2fev0oq48a/fapeboritusokov.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/21999888858.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/61347374440.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/dawume.pdfIn PDF document text
    • http://midospa.com/upload/files/wikes.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/97974457167.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210901171340.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/dubuzenegoxegisibedofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+app+to+close+all+running+appsPDF 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_off0000c50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50F 10768 bytes
SHA-256: f86f4ab99aed36bb023c3c254ec4326d1a37a52c084c5c4e472f900f01af2ec5
font_01_sfnt_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 16932 bytes
SHA-256: 0e053583dc3798a1882618f7fe8b262dd80979d9a454e963cfe71aeb7caef091
font_02_sfnt_off000109bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.