Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed419cc3ac69dc12…

MALICIOUS

PDF

80.4 KB Created: 2021-08-27 03:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ae9f89e5918df4c32a9519b09bfae14 SHA-1: fa441ce1ddcd9ce80aecc4eb12333e73b8145010 SHA-256: ed419cc3ac69dc12daa130dfd9d980ae46a520df973c0b41338d69db6f01e24f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://archism.ru/uplcv?utm_term=zoo+tycoon+marine+mania+and+dinosaur+digs+download PDF link annotation
    • https://rusepress.com/uploads/wysiwyg/files/40462987302.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/10568265292.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/pekidewusegomaxosutu.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a2f5db2b6fe8e866ee9d3c9445cc59bf/megulikazof.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f3d111368---suwuvigituzubomin.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/a8832e2b4a5115004be1b9e0d97cd868/72787513698.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/bared.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/vobuzinub.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/gexero.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a10bb201b1c---zajavotowokunixa.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/gitusakilef.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/99732466550.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/55868134198.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ef2d38bf1ffc4994311fcab73c2286cd/vobisapebedijugasivubomu.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/raxizufexegenu.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112cf331aa32---fikudedesas.pdfIn PDF document text
    • https://defi128.com/userfiles/files/tawepawobosagi.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/15251868444.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/6631a5c6ac01c017ee47405f0184470d/mepidupipot.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ba5c5afba37db0946746ea5a2ac4542/xelasakunid.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/e58f4255d40b34d19ba2690f88c8c78b/51416097157.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/8fef2aeeaf6bc1b10d8e440133d37a6d/11140733597.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/f400f3cdd345a319be1524611e8f8328/fojizeremubumiji.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/99342524977.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/88738923148.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a2d22d32b---nidipedupilisiridakopa.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/3626283792.pdfIn PDF document text
    • http://imzonline.com/game/index.php?title=Zoo+Tycoon%3A+Dinosaur+DiIn 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_off0000d114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 10976 bytes
SHA-256: eada3ea3deebbc8d069f8caa863616011c0237f68b8f99989fc14effc72db15f
font_02_sfnt_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 19412 bytes
SHA-256: cca70a6493855d7f963e5df235a74f5645f118d2109b1e9b529ac786f29e95fb

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