Malicious PDF — malware analysis report

Static analysis result for SHA-256 457a206d36ec07e6…

MALICIOUS

PDF

86.9 KB Created: 2021-07-21 22:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dcc5e1080fcfc56a40db624f41c446a8 SHA-1: 6325b5b9db7a655a67597d780b6b7cf0ab47a983 SHA-256: 457a206d36ec07e670dae24153304790684d87ddec5cdd1db22dc610cc461ebf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160872c4fae9ec---botiluwifepemisezulugen.pdf In PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080b7320c858---50529876827.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qrp1d2nsrogtsu0j3s40i92ct1/kogerotometinuviwawu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0981b238---rejimojurukotazudinuw.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160877401a7b04---87684147375.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/12787577777.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/04ab50a30aa8ecc227b122ec6d2fe5c2/25711485471.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbc37d7376---sepowapebozirur.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/vixixapa.pdfIn PDF document text
    • http://flexa.cz/docs/file/53744366277.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdd3bcdd65---dusubowajuxoz.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608e85c624bfc---73109103911.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/ludefaluzajaw.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab1241f50---puzuxivitipajimudubir.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/pibaweliso.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/xozugujubisomowilofopil.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/pasuge.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/toxalebajupagukiwu.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/sifawuxunamejesegab.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/girukelepaxidoxewaxoput.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/75430619868.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bed8e60c5---pagariwirubedonid.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/3dcec4cbd4cc42c982a9db03d9ab050d/wotivegajivijogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=romeo+and+juliet+act+1+scene+5+stylistic+devicesPDF 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_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 16836 bytes
SHA-256: 55ed696a389e32643fd2bb88a5cf99ee102c377d06a7fdc77a1bb315036494b6
font_01_sfnt_off00011aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAD 11072 bytes
SHA-256: c67275b82e3ce0ae6c2aa763f7155234b1d4a6466ab56f6bb6d6df803d61d451
font_02_sfnt_off00013488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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