Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf23db2bfd582709…

MALICIOUS

PDF

95.8 KB Created: 2021-07-26 04:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8021a54e97ab29af0178944846371ce1 SHA-1: 172135532bf80bfcfbe8dff644f8404ed018240d SHA-256: bf23db2bfd5827099f4c491c1d978fb95611aff01520e419f35f742e349ab6ce
176 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c335a2aba1---wujonedexovuso.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6e5f6edfe---mezatave.pdfIn PDF document text
    • http://muszempilla.com/files/file/tetamimorevi.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/vulasosofidifitokaziw.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/pujekixeki.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210503070214_1423290005.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210726_BB5AE568005F56E6.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/2a8d29a352d2955c8a7d68b802ed1a9d/16767440800.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0b0d3a13a---zesanidozujo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1d54a1ed1---xogim.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608029a847975---xoroxexigi.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/876b6d7f288c6b22ba622d32e28c36e9/9541452922.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/bafotuxogutud.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/95119412e6381e21978cd649676f1c66/94212895646.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/hpksagcnqfd3vqathkuqvr1cgp/felezig.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/99449724973.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/pifupudetewarub.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ee8c1qn9fdsin29ebjb4eh36ii/wogepaxunowafobidegosim.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed303ebd2b---7518290497.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/4auitlqvftkov7ao1rag15gp87/15465098065.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/wuliveposalarebulazux.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9f09407302c18ea2389bef6fa50a16aa/gejenuteka.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/40578759467.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9d3fbce500300cea780bd5d1250f282d/tened.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160970a012f564---kotenif.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/felogumekinomabigu.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/guzubidiwatofijavawoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+jio+call+details+without+otpPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 10896 bytes
SHA-256: fcaac86473170b3efe7c84b1cdcf15ac7769daa455cf92305158a7ab3668b03d
font_02_sfnt_off00012baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAA 16612 bytes
SHA-256: e73b7b1089ac2408b1a8766ee82821e83ed462a86762715388cdbf1aefd5573a
font_03_sfnt_off000142f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F4 17056 bytes
SHA-256: b3ca7b3fc788a11f48b0f9bb75c232b9914e2580e0e8243925e387c4554b580c

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