Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ad2112a3313be3…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 20:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ae74a8c713c50d6dbf9c70a9f7c197e SHA-1: f1652ebc11ddf620c8c5ccd5ba64b7b78d09fbac SHA-256: c6ad2112a3313be319526fa8f922e1700d9f2501427f4c984c4612e703021be5
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document is a link farm. The ML classifier and ClamAV detection indicate a high likelihood of malicious intent, possibly to distribute malware or engage in phishing, hence the 'Spearphishing Attachment' technique. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://summitremodelinginc.com/userfiles/files/wunonimojazulivatumujoba.pdf In PDF document text
    • http://studioego.cz/userfiles/file/dumozakuj.pdfIn PDF document text
    • https://cardolf.ro/files/nobufabunamunifupiwurasil.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c2d19fda4---27274365564.pdfIn PDF document text
    • http://aimic.com/userfiles/file/walipotiparaxaworatatum.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/tevufotupasugipibuvod.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/luluwajojopuwev.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788b82f03d7---59995004069.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/94109344842.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/14587498063.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/nobotupu.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/93187562365.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/mesagirujarafovomileve.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161200941a8678---xikevakexus.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/wevisutanowikiwuwufabov.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/5de620b26b14bbaa3fe773b4ab36879a/73770890887.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/zuzijeluxeveziviwe.pdfIn PDF document text
    • https://olterus.info/contents//files/nigokexowulipukut.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/74796465084.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/kopubev.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49e156a050---devalanovalaga.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fceea2c0e91---votewepivumikavigivoxep.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/b71187d0c6163654c4a628d69ebc858f/zutaluwakukud.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160723bca50b6d---52889669479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=belajar+membaca+candlestick+pdfPDF 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_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 11076 bytes
SHA-256: 57f32c196ec323dd60ea89d5ad617a5c3dfc89a582ec3d0c8941041538babf6f
font_01_sfnt_off0000f693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 17448 bytes
SHA-256: de52498a577dd06cfba1a2d9d39152e16c97bc4c8d4f5ba4d2ad472ca31b754f