Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc52a6105da59c00…

MALICIOUS

PDF

73.3 KB Created: 2021-09-25 07:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4068227cabe32aa6e11f91b1196a1e80 SHA-1: aef9a4481e4f8d80d30f884525d0cef710f20525 SHA-256: cc52a6105da59c00711948e84098201e9d697c4505168829bbc4113146f544c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=android+core+prime PDF link annotation
    • http://tce.vn/imagesflashupload/file/wusudemew.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/tudavupir.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/kovuvij.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161326dcb9770f---34351461025.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/pamuxiniledipur.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/simaduletufepajurumavukor.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/56045960165.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/493fcc52e340c346f7c3f9de703f6264/1977287519.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/78185165347.pdfIn PDF document text
    • http://rococosofa.com/files/files/sopolanawajosot.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/96596742973.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/fasikomonimosasugirit.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/bobopasofezejitepele.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/9318479223.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/vafojogin.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/88761707561.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/gagufasivitotanotomel.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374037c354e---66707124747.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/51190148965.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/81048645350.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/41514135396.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/ponulivajefexamasivetata.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_off0000b598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAF 10184 bytes
SHA-256: 8205bf87782277c272950254465d4d7c776eb048403ba7b67627204915d5a73f
font_02_sfnt_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 19740 bytes
SHA-256: 3b9822b27323e0bf724c84f9f0aeb361cb5f900bcff4ce011f00c0484c739905