Malicious PDF — malware analysis report

Static analysis result for SHA-256 758037509c77ba14…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 19:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d4bc2fa27c056bcc48eeeb4209a7e9d SHA-1: c2f5e1b837172023ab1e07988384d8185282b4db SHA-256: 758037509c77ba147fe2b2a5bcb6de52c8cb381b0644b577d24996dd1dd16e7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=weeny+free+pdf+merger+indir PDF link annotation
    • https://faktxeber.ru/resimler/files/liripi.pdfIn PDF document text
    • http://termocity.by/pics/files/32584148126.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/75729965932.pdfIn PDF document text
    • http://jawarakreasi.com/file/20146193484.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/1018821221.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/14610517267.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c76654e8---romunekotufugibagurezogux.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/musenoxibakipugusap.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/41966485419.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/wasawe.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/73596776861.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b48f9161630---jotowowamabufokesewi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f2c87f30a---75721425215.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/fibaje.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/73354604192.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/fikubus.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2e62bf254---59405121097.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a35919da5f---kegoxajorodulosakixos.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8d7c42174---18882671075.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/27851763165.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/gipumuzerizugetezusinak.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080f6aaab990---52199588454.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/virupexozoveju.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/48640190748.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_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 18436 bytes
SHA-256: df9db96574cd9c008114c4c2080d333236e2999138ce05573449efe1a40a8a80
font_01_sfnt_off00010919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 10352 bytes
SHA-256: b275d4f158894a76579744a1b4a98560a411f5a9613bf0101176e3e59ae7e507
font_02_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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