Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bf81bf535566a1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 03:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 339efa95f6a7f7e5d86e7f7efaac8da2 SHA-1: 4c0274932faefe2cab9a709f80d07fa05b08063c SHA-256: 78bf81bf535566a165fc3e91c08422d4d87fea2ec52efea44fc959ffb728153f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly indicate this PDF is part of a phishing campaign, likely attempting to trick users into downloading further malware or submitting credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://garglob.ru/uplcv?utm_term=merubah+file+pdf+ke+word+gratis PDF link annotation
    • https://hrmconsulting.biz/upload/files/56927742834.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/mujitenawofuw.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/212e17f6af71c94acf7b729edf163ab8/ronoku.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/saxusamapebetezetevu.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210901_025012.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/23941741349.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085747e6d208---budoxubuvasadelonafareni.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210817164742344.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb424a98303---46758110976.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/wusejubilaku.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/76326151911.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67a9b09a15---nepokunasinumalumazabe.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609f64753195d---71619086473.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/nc9l2e2chigmbdr803b7kl57ml/tijodefapatorajezamumije.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/kawokubaxovumudojetobus.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c39868b09c2---fipatu.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/gudasabunagosodu.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/xarivoloja.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f9869583a11291f7e46d6fcef375379d/sumivutuzapopoxebedunozem.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4758b48c---88116646158.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xapiwomifafebawilasikikug.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb9bbbccde---91068922674.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/1641221060.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/sofafipovu.pdfIn PDF document text
    • 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 17408 bytes
SHA-256: 4dea1383ec03bc35242d4f819950f9b8d34b2a0bd50c59e75f635cc257541771
font_01_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADC 11084 bytes
SHA-256: 188a490ac6b345076bdea346b0a0286efb9409cb00ba68a9536d63d9045cc6ab

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