Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b144631fa7b0a4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 14:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 514668f7204823913ffd573ac5c15bfb SHA-1: f39ced1c942f38bc549dd6c656145eed7c285cb3 SHA-256: 48b144631fa7b0a4f8a87012c09ba08389dc60ac309e75e67deb85ad07e1c87c
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. It contains numerous external links, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The presence of these links strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/bofonadibuseguseribo.pdf In PDF document text
    • https://krygina40.ru/UserFiles/File/zexumim.pdfIn PDF document text
    • http://gekon.net/userfiles/file/64735942907.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vuvadojajub.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/48664032963.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/53357286168.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/88378420042.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/41088892136.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134cfe1c6746---73836601547.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/gafij.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/bufuzudumafugewal.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf2980605---36322205338.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/jidixefu.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/ffb4d35785897a783eaec13c95f37c0f/muwewuxovan.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382c5658fb1---49133774859.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/vatolofab.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/49833121777.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/32246156075.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/57skncgij1v2h0sunmset7t894/67819481535.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/88120301058.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/29368005366.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/12872205255.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/sedewag.pdfIn PDF document text
    • https://limadelimon.com/images/file/1063181846.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/26948461793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=iptv+pro+free+downloadPDF 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_off0000d538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD538 17588 bytes
SHA-256: b741b00b133b6827226d9dcb51e46c5e1092a036ad6a05e462b3e37ad8745afb
font_01_sfnt_off000102a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC0 10332 bytes
SHA-256: 978f7b7b7654bfc8dc796593bcb2b4e46d86f9436ee57836ed6cd29ef34addb6