Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce45000b15d3ff6…

MALICIOUS

PDF

73.7 KB Created: 2021-09-09 00:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd49ead849f805b78a7de3e07eb02d63 SHA-1: 0a3a4a5bdef896338e2619b383b3eb24ce89a625 SHA-256: 5ce45000b15d3ff69030df682d7dbaaf0a1cb97b0ae10abd9bda7eda3130e00b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites and other domains, likely to lure users to malicious content. The presence of multiple external URIs and link farm indicators strongly suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://stef-nancy.fr/upload/document/50359434936.pdf In PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333d8bb4163---fafumikufibujotisob.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/jilelarozosebapagatonigi.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210901104515257586.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161392fa940983---visevaj.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161339c2170df3---kenujupoxubofupenawixo.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/jikigoxeduwakumov.pdfIn PDF document text
    • http://eksternest.be/images/file/84113092629.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/bomijetefuvut.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/gurudul.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/wimipew.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/watipusejub.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/rosesitejexopebikadodo.pdfIn PDF document text
    • http://electric-kernbichler.at/ligopokafevabu.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/tukegujaxapupoxili.pdfIn PDF document text
    • http://kelsenator.com/userimages/kanojifipofarudageke.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/laroruk.pdfIn PDF document text
    • http://farashimirooz.com/files/motapeworodole.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/16756904938.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/68859723239.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/nalezizofagusesopomemerom.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/dikovegodanezoxep.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/4520016377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+download+apps+in+mi+tvPDF 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_off0000bfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAD 16308 bytes
SHA-256: 09ef2fd40d4a7bfae2e4b4742801106c357202a16e4c594f86f4c86eb247fcb2
font_01_sfnt_off0000e997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 10464 bytes
SHA-256: 571b24afcb7cbe9fc2e8a85ae3abb658b9659c88b0d7d414b5152d8ab0f2fdc0
font_02_sfnt_off00010154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1