Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e120f87483f4c1…

MALICIOUS

PDF

84.5 KB Created: 2021-09-15 20:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1b9fa563f439a01978e2bc77358dcd8 SHA-1: 4eeb71a9858f408db633601888f135b3843dc4ad SHA-256: 38e120f87483f4c1c4e4cc04873892fbe89b19098449e8ad46771cd541d3dc4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrustworthy domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=ace+the+java+coding+interview+educative+download PDF link annotation
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/pokuzisulujebotolo.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/83839769225.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xafefezowaxi.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/54782962157.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/xanema.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/xokiwavuzoravobibe.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/76542815625.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/64340625145.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614042a26572d---taxedugadunipogu.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/vezewegatel.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/namemuluxerakatagubegoz.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecce8bf858---70600366998.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/60263884792.pdfIn PDF document text
    • https://palet-school.com/files/files/mipegobefura.pdfIn PDF document text
    • http://skia22.ru/pic/file/muzuru.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/fasagexa.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/xenawokenizumegom.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2a5f4eb8c---wuvuwigotevotik.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d81de6e85b---88960976140.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/kikazilafe.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/fubobaku.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613d24717f2c1---gomezopar.pdfIn PDF document text
    • http://koddous.com/userfiles/file/vutoz.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_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 10844 bytes
SHA-256: fba2a19013b3790dbc98cb37977f8c322c146901f63e4fb43374490aaf69d3d5
font_01_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 17432 bytes
SHA-256: c0ca0cc87f2704967f8a7326043235f831c3dcfcbcb5e25f5886f3f7f04a04b5
font_02_sfnt_off00012bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.