Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb87b2551a968db8…

MALICIOUS

PDF

84.0 KB Created: 2021-08-20 19:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 509da7562d67e1772ae2ed8f62979635 SHA-1: 1d782fe0e6df699797fd31cac3e86614b2163896 SHA-256: bb87b2551a968db89214ebd0d0ec5a33eb0eb71deef89089757f5257c53911a8
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=night+elie+wiesel+reading+guide PDF link annotation
    • https://systematix.pl/userfiles/file/midarejuzajolibite.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/79336234199.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4586e3528f08e789380d4a6cc4957445/38917938884.pdfIn PDF document text
    • https://digireg.nu/upload/85107912586.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/0da66e7a4c6d5e4752f83008183605d9/93253837778.pdfIn PDF document text
    • https://empresa-venta.hr/files/giwilekurawovulet.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099c8c86029e---mixajonu.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/9chtvbg5c9gjqe15rfg0gid71l/kuribidesaro.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902c3d0f6c3---65139024666.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/juwodetopupoxa.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/legitutobimubusufig.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607da340dc1fc---17982755364.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210630_A3C04ABB7B085A6F.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/p9nb3t61lbt27c35dd4j20p076/libunibizugadapatakut.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d305f94aee3---26974371151.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/16856303966.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b097676a---totowibok.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611699ec73b98---21407903357.pdfIn PDF document text
    • https://ddms.tw/upload/ckfinder_temp/files/20210629032602.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/434557368.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4a330824e83803f1a5e7c9f16cd06022/ditetuzova.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c27691987---40777257264.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/cjbmedvj6v0q1gc0a204etv5v2/lumugevit.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/35202535512.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_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 17452 bytes
SHA-256: 1cd2b82547f6724450559b340ff28a76fe2505146e1c66f295553368eb84a7c6
font_01_sfnt_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FC 10572 bytes
SHA-256: a1418df4a0bcb00e830c60f529c4483264a31aa3dc2bf6afbdb8ae79ff34dc72

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