Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d2877c7a44c04a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-15 10:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0ac404ccdd87ad43b5cbbf47be87f92 SHA-1: 356ada80e014b077e19e0beac39a2eb76da40381 SHA-256: 49d2877c7a44c04a85254840c463d75b44297ccac5d02e4c4285c294ae9ebe33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or appear to be part of a link farm, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://ht-cooling-j3t.com/contents/files/vexoket.pdf In PDF document text
    • https://natatourism.com/userfiles/files/timobupizobawoso.pdfIn PDF document text
    • http://state-lithium.com/upload/files/nidosi.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/luvobexafow.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/lazetajol.pdfIn PDF document text
    • http://geasit.it/userfiles/files/jewirududoduvomewapelavi.pdfIn PDF document text
    • http://bienbao.net/uploads/files/tenutibamix.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/48303016058.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7bdbe6a69---motufesolon.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f54163ee4---81592630220.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/wupusiper.pdfIn PDF document text
    • http://tzsunup.com/upload/poresigusalusezilufu.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210911085445.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/tozivuxisuzixirulale.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161415f090e8a3---pedal.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/tptcmed4i0hipgtja0e2argci4/64233155667.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/guwatirupinevorozapegibob.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/274432796.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/53273397649.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18a7cd4a4---bidip.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/80068626596.pdfIn PDF document text
    • http://skncn.com/u/files/85360831861.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161401c0bc5391---mumubuwofuladajugiwibiza.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/munumibuwofivurur.pdfIn PDF document text
    • http://stylekd.ru/files/26324827293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=six+sigma+in+pharmaceutical+industry+pdfPDF 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_off0000b315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB315 14696 bytes
SHA-256: e14432218d9215f471c4351c40f3f092d5e8770a47daa737a078daf49e0e2bd1
font_01_sfnt_off0000d76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 11336 bytes
SHA-256: 611a8a2b3d0097466133aa25773494c6893230c8859e87d96f88215a4330bfa5

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