Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d7531041173c6e…

MALICIOUS

PDF

73.3 KB Created: 2021-09-12 04:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27723785032a782ef99d5af99eedc44d SHA-1: faa14d07bee3adc78d9e656afbf048a16cb0feee SHA-256: 25d7531041173c6e4ebb80db092a4da3b3756f584bafacfee74b902ae6a6eb51
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as 'https://pistant.ru/uplcv?utm_term=justice+league+action+full+episodes+download', are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=justice+league+action+full+episodes+download PDF link annotation
    • http://arndt-fahrschule.de/userfiles/file/megot.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/teriti.pdfIn PDF document text
    • https://majubesar.net/contents/files/sugolapirutaxa.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/mh5g9v0v0vcc8867iuusnpojh3/zibimigigakaxu.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/da2cb018d99f3cbc66a1cb0d16515bf3/mobaxikemaduba.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/73093471747.pdfIn PDF document text
    • http://195exim.com/datas/files/juxoginebuwu.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210904044920.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/vofojine.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/nixidukasekojawed.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210905_032903.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/36864920888.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4f252dff6---savatip.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/numobanitotidenolad.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/dujalogazavuve.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/85235233538.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/68587852088.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/luxopafopofibisisosasup.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/80445522568.pdfIn PDF document text
    • http://tid.vn/upload/files/gumofusumibe.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0c3e59117---24062859937.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/bovudow.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_off0000b7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB5 17952 bytes
SHA-256: f8eb7aa408097ee3d12643b7e965a973d00dff2f3438ff2794652a6491eabf06
font_02_sfnt_off0000fddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 10872 bytes
SHA-256: ab4635f19710316584de7df35be5349c69a1040467025e1f9266608b9153eba7