Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5655a44aca3db5…

MALICIOUS

PDF

87.4 KB Created: 2021-09-22 09:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7905024d0aeb6a20356755cbd0b02fee SHA-1: 7bfc282129325e15e4614117dd087280387f0953 SHA-256: be5655a44aca3db53d498c9fe077fabf5c85ba244ba6771cbd5b9fc1ab5457e3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and heuristics indicate it functions as a link farm, with several pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a lure to external malicious sites.

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://queure.ru/uplcv?utm_term=how+to+get+minecraft+pe+for+free+on+android+phone PDF link annotation
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/98047994239.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/19149884893.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210916012019.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/jelowogepazixegutukomabe.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/lumafumobolib.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/gawunijofi.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/95249799859.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/gubebigofedogu.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/xasaputezobofikesifab.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/sedupurusu.pdfIn PDF document text
    • http://domexpo.ru/up/file/vaxotef.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/kemozodisafu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c06cd62a3a---viduzobaxakalezodoba.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/jezusuvesubimaputadizalol.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/58597d4023f01718824436783ac5d75d/90494074804.pdfIn PDF document text
    • https://termoformat.md/img/files/sebibare.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148259537d26---pikirepupibaj.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/50020096215.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/rozakulotofi.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/70093965101.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145882c8c8d1---43362793829.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109110043026783.pdfIn PDF document text
    • http://potya.com/13758081129.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/gorijot.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_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 10932 bytes
SHA-256: 512c502d4eee0a12309603af41562ee62f4313ed3be9da3753b13bacd4c448f1
font_01_sfnt_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 17620 bytes
SHA-256: cfe2512f481dee7fd083fa66857bf40f1030476e6d2f7f677f6917566af4ec15