Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7bc4a408eb06be…

MALICIOUS

PDF

76.2 KB Created: 2021-10-07 12:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 632133553f171870bc686fdd44892ffd SHA-1: 152a57d6433397ab1f22ece60dd1f05c93301385 SHA-256: cd7bc4a408eb06beb52c1faa857e83e361fabcf454c39ce0e15296ab56550323
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring users through a malicious attachment to a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hidramaco.com/files/files/53626625581.pdf In PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615e51cd6729e---48033919162.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16150e40a330f5---28456081894.pdfIn PDF document text
    • http://zamgph.com/uploads/file/040853452894.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/aa6551010ad289ac954d700918cd9dc1/70765454300.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/vexofuwokonit.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615e819d084f6---lotigurugudebomuz.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/busekiretupudejefedavuvu.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219773391809.pdfIn PDF document text
    • https://path.mn/userfiles/files/83299204624.pdfIn PDF document text
    • https://ef.msfoody.com/upload/files/nifolutugewifonepojokos.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/14944667770.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/gitalutokenimazupejameve.pdfIn PDF document text
    • https://dcimx.com/files/divazinimedumaju.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/nizopof.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/rimakunujepovejevadigif.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/14713672874.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/523d7c9520847dfbc5d8c7bb66d8d986/xebadupojuwaw.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/8038725654.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/sufatexigemogerezosaraweb.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614edcf8a6509---finorowapi.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/86557041743.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/1266995526613fcf79825ca.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/guxipoxudazenokodurenumu.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090201005573499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=example+1.10+physics+class+12PDF 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_off0000c6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C7 16816 bytes
SHA-256: 08a2574a9141f150d56ed64e08db830a47bfb9a19347ce421b68f143904b2cab
font_01_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 10776 bytes
SHA-256: 6630bdd293d1ddbb1346337cf4571f70ed090671fb3c5f5396a27e04fd0f62ba
font_02_sfnt_off00010ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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