Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f15945f152a9e4…

MALICIOUS

PDF

77.3 KB Created: 2021-07-01 10:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 35c7970bb985a234feedeb0d47a18cc5 SHA-1: 471e63f57c23fbd53979c6e766e2dcdc5070d0eb SHA-256: d0f15945f152a9e4bfc74d550492c66c6ecb59909807c022dfab22897ddeb40e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute further malware or phishing content. The presence of multiple PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d8216c48b1252e0b1849eb4b90e3d1b8/16412794455.pdf In PDF document text
    • https://ikitellirezistans.com/upload/files/muwifuf.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39422ae948---risejuremikogapesomu.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/sifomazegawifim.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d063d9d8e---59273776945.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fa242883---3864091983.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607916d5ca219---kifusu.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/6b272b0f6a2b9446f0d70f6c7ae62071/tutikonewagisosemekukup.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/wuxefijopobokavi.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e8dc030fdf80045a4c073f979d7686ce/gusevalevijawapuberepis.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d884d2aa40---poxoletirol.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091910e77c3b---neguziresowibilo.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/gekemidenakukujex.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/9dc0746168f90f521d2e0999f0441783/77066021638.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d7080ad8cbcb924824901e25b8496e2a/85698001709.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01d2139916---18604399743.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-5/20210505074704987396.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/kodopukali.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160785d79c1371---komaxasebugawoxetosefavem.pdfIn PDF document text
    • http://hevolta.com/upload/file/fifubas.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/fukolemogosororixotunuj.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160abd088e3dff---94757030211.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/22905007363.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39d1be2e71---sodej.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/85005821877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+weeknd+in+your+eyes+remixPDF 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_off0000c738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4A 19216 bytes
SHA-256: bbc2f5c678083060c1ed66ab9f06c6508f2a943bf1070ca8b5f132d09ec08570
font_02_sfnt_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 10664 bytes
SHA-256: eaaf1f3c87588e50575ce81a1c24b48cd4d414205689ab093b7791d61c90cddb

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