Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebb819415d7cd5f…

MALICIOUS

PDF

94.7 KB Created: 2021-09-07 02:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aa48a17e5c1bcdb5d8b183ffc7851564 SHA-1: b1b9dbd1648925f4d851618b7f2ef1a54b519df0 SHA-256: 9ebb819415d7cd5f548237aa204d15a1cf5a43b4c7e15dc90a8e9c6dd6019c81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a fake invoice or payment request, further supporting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pusancard.com/userData/board/file/nudalitixixalura.pdf In PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/wegeverorigu.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/81395410183.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/25374017944.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/sasibadaxifuk.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ef2eb8a4a---6336459063.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/lebegojopatopegujegosapi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db5ec588cd8---95882234422.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/41347794811.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/toberevagifavusunete.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210619060749.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/vemesel.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/98522146185.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/95309772361.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160861ebc56813---93350982814.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/zewuwadu.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/rurunoganupivedobirofile.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/fopazimalidukulisewixobos.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-07-06/images/files/11075779234.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/rifezunabe.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/zavuxelulapilad.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/tafewenajawetuxan.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/32f961fda9aafcdaca2d5ab79bec5057/kilemivijumogivapu.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b02c8010---56308287415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=canada+visa+application+form+pdf+2019PDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/33743693802.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_off000109ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 11208 bytes
SHA-256: 73bb919e38cb849abb75905137a787ebd3b8e2fc2c43f68ba2d3d01ded274acb
font_02_sfnt_off00013c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C63 18748 bytes
SHA-256: ee4883bd74da50221d79871f854b81f29f8883c51ba9e802988e49a163065c02

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