Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b30d8699fdc358…

MALICIOUS

PDF

71.3 KB Created: 2021-09-04 12:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc76276885fe92890aaf4411722e5f28 SHA-1: 69d67ad65106ef7b0230b929a2f5c01b5442debe SHA-256: 12b30d8699fdc35827c086a0f7b4065ed79f1c42fb8f1d96af065aa14f47800d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a link-farming or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/26827176368.pdf In PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/guzobexijarabedigiwi.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b8bb5f3932abdc6ef33d199b8a7f4481/1779748213.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/47919819e6362b1523f19634d7c4ff38/36218564751.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/57da31fb1d7c3f55e294d9f51aa20735/53910669154.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/89557424157.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/96737181915.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/69076127072.pdfIn PDF document text
    • http://boldogelet.hu/media/xevevixu.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/dd6f1b4ff7ebe616f189d2fe616b630c/rapaliwasunatakekinoga.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/gabemiwonizizuzorovovesez.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/lojomap.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/82992871090.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/rabupugasekesolebumujo.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/zosipisaburolovamibetob.pdfIn PDF document text
    • https://stauber.lt/images/files/50728159921.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/68691259843.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/wigut.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/konewodanuwudaz.pdfIn PDF document text
    • http://ned.ru/uploads/files/50371416817.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc603e6b4ec---sesedibiwebakitixevud.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/pofexameb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=designing+sequential+logic+circuits+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_off0000b80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80F 15004 bytes
SHA-256: ff66d21b04a7c1c3c65a9997ff27d019a9589babc0971de8857cbf63b8592fb5
font_01_sfnt_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 11040 bytes
SHA-256: 4d35e0d3ba82e222e28d87c75c98dbd0097b38befb27acb62e1a5b0c3914109f
font_02_sfnt_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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