Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f3c768a49b86f6…

MALICIOUS

PDF

143.1 KB Created: 2021-09-05 10:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5fd06646f65108cb023bf3134d393e6b SHA-1: 8cb6fcff5100cd9392b5396038c77825dfe3deff SHA-256: 42f3c768a49b86f679cb85f096449c5c76bfae2a4beb9385b5a637d6261e3efd
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=ge+carescape+r860+user+manual PDF link annotation
    • http://greenplanetnepal.com/userfiles/file/18240147467.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbce4cfe9d---5254550147.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/55f5a3220bd570a70b8b81e80acfa8dd/28643548583.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/78697238174.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/nurabifena.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/laxurara.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/13551531858.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/femadimililolozisepe.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aadc196c5---10963078763.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/f8321c68129198616f3b4eccf9aa9feb/98586389858.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/30627735187.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/51506236334.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2ed583184---malanesasopinawutigipeli.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8724841f9f---tebura.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/56897299102.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/jimabetegagek.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bb1baa2800ad9b5a096a0b86051f9b0e/7271990825.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1c876d630---36526883852.pdfIn PDF document text
    • https://primer-spb.ru/files/files/5847327447.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/67063747791.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/nilajazuxamopajubenepiv.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/dejaremukiwajol.pdfIn PDF document text
    • 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_off0001ca66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA66 19456 bytes
SHA-256: e65cc4b01adc90d347f3b2743c70e6a1d9a46a5848f0efdc3414799b69d3cf3b
font_01_sfnt_off0001fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD09 10864 bytes
SHA-256: 4245e0671a7c39685104d4eb5c7e8e6dbd453f3e5f591cfa5222c5dd80aca0ab
font_02_sfnt_off0002161b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2161B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1