Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6bd161d07b907e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 07:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8cb577d1b51ed3052e11fc8f55424588 SHA-1: cdcb179a87aae707d921fec33a185ccdae6fc511 SHA-256: 8b6bd161d07b907e832ff9f112e3c3b454b754d43f5619e817999b047f4bf3ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, 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 campaign, likely involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=appvn+ios+version PDF link annotation
    • http://christ-china.com/filespath/files/20210909081618.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59ed31686---49650115419.pdfIn PDF document text
    • https://ms1oke.com/contents/files/nuzepikuvuma.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/6557057361.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/85184663159.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131820684c7b---firimolopivufupupijo.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210907031148.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/65812493731.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/68a2cac5301a1ce7810bc2620602d67a/89523022507.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/wajedas.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/zatajoxurijufa.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/97099591193.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/nuzovudivovubi.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/gufitegumezivozagukuno.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/82996897739.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/23331301733.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/nisavazivev.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/tirunibizuduv.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/devebofedojajonutalipotef.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/76470040418.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/40813569617.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/51491185418.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/75538724156.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210910181926.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_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 9984 bytes
SHA-256: 76ed43ba5878a4892213c9b89a31fdbe204c1b22963fa99801e43cfdffdbb8de
font_01_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 16716 bytes
SHA-256: 7c30a8af5d9adbb29d212cbefe268a13095b0e3f7217a2ea1608efb09d3a9dd1