Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28a181fccd0a9eb…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 14:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ba9da31505af1e19cd5aa0955ed8d81 SHA-1: 254e7759fdb585e261a544d1bad1d4e543f17c89 SHA-256: c28a181fccd0a9ebf35fcfc43e45f5213424683b2143d9b2db30416f6bbb2991
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=concept+of+budget+and+budgetary+control+pdf PDF link annotation
    • https://incoyun.com/calisma2/files/uploads/42239723423.pdfIn PDF document text
    • https://signika.pl/Upload/file/firabux.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161242e4505ae0---jukowuxazezideka.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161082a0d73c1a---65580725685.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed964f0a38---saxobelak.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/sofozetijenitukaxubenax.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/pefamuwokoti.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/31468074834.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/kafqmfb7271ot8gocu8t9t111q/33770816451.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f6fc8b309e2b05852d4bb2efc9f3a299/35759113370.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/12777567306.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/46615806485.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/gutaxodegakavuwagujevabud.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/luvusidom.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/691bfca56feb46278052c01ac3f1d758/denexageziniwefolam.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/nuxosotimun.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/bunarezibijanizaj.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/kujotazoxofagu.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/28303556115.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/patakofugazasikuzobolag.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fddbb2582ab---80832007464.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/dewupe.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/xoroditabesiwevixawomire.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9689b11021---93505730476.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/sgv21u9qvutd7bbov29ooa8gin/18623440054.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_off0000dd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 10920 bytes
SHA-256: c99c5fc2e8f817160911fa6d93795c13537190dd0bc3c32268e39f30319ab3d0
font_02_sfnt_off00010e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4A 17456 bytes
SHA-256: f2d9d0be992b6e87bb7bd033bc78edfc54384db15e26b37c69e5948852a28374

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