Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22e586031bc2fb5…

MALICIOUS

PDF

74.4 KB Created: 2021-09-03 17:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9ecafbb78a52090d452f9b0b16c3e985 SHA-1: 325f8413eb095a628b826ccf5bf0e99b217465c4 SHA-256: a22e586031bc2fb5db3d934639e598da311a8a7d2b7d96da2fb6c8aaa39c035a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://laborke.ru/uplcv?utm_term=g+minor+bach+piano+sheet+music+pdf PDF link annotation
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984252d7271---66342228498.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/lasaxoxawatu.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/derekove.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/67chvo4cbtq98kle887mah6b5h/bularigoguxezavel.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/kifedulemo.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/sisanodef.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/64855482361.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/44009138304.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bca78854ea9---pogem.pdfIn PDF document text
    • http://yuha.be/_files/file/44070516393.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/felugezodudurov.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/budubopaxufunukugovik.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/putopubejuxoxugexikokuno.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/powozakudog.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/80310563255.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/pivefufejawegubasevegegod.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/84643385456.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/48993291635.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/bexekadol.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/48977911038.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/60645445ddd2e300faf42884fe761d27/wowafixuxog.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/15684528483.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b530488994---zumugananowesogoparali.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/72524834671.pdfIn PDF document text
    • https://rjpexport.com/files/13711867511.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/refosajujugolekufodujut.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_off0000be8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8B 17100 bytes
SHA-256: 95af52177d4508d0df1ae063f1b55284235e13d6dffb8d6e51f7f45216c1569d
font_01_sfnt_off0000ea5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5A 11116 bytes
SHA-256: 61cbf4870e39b6869618760f5033dafd1f86ad74444e2aeb3bb51bd26663d9eb
font_02_sfnt_off000103e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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