Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ffe91425df524ff…

MALICIOUS

PDF

73.1 KB Created: 2021-09-08 03:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3cf5a0005f71a28021a0f12bc116f43d SHA-1: 1d654f74ee34f8af3c75623ae32136174164e2a7 SHA-256: 2ffe91425df524ffb5a9aa0793bd637456175a39ea551638724699e4f1a85e27
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious sites, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for containing link farms on disposable hosting, further supporting its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607481c645a07---bukarizanikitesewasafem.pdf In PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6121d83e6079389cfecf934423fdd18f/47691070569.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/gubebugikiwejiwen.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210705182948.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/kenebevirofex.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073c695d0809---16664729311.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1f8fa3f05e64021962f724af1a87a149/xikuwesaderiwu.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/66d1605f23eb3cd358b7ddb7535ff5b9/91412555351.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/95642127411.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/zegukanuvinivosakataj.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160735f1ed2dfb---lagojenirafuvuzugiw.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cfc76b56e---fofolesekanova.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/d8298f5f0d31b436501e32b93efeaf88/jovepag.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/12276762834.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/15240915150.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed0cc0fe29---86922105999.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ebab225b4a---45305710102.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/nogus.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/27042049099.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/u85hnlkav4m8ee2d6kaco4t7qm/piwulit.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/rasanidegag.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/52423201634.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/51545293016.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/010638153074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=icdl+course+free+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_off0000bec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC1 16244 bytes
SHA-256: b1dae28abac8bb69f4593aa8d433fcf2d8aff19d7a4bceb4250a174b68e98f7d
font_01_sfnt_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 10208 bytes
SHA-256: 58ff6423bf7ef357f5788c40f4de639d9290699b85d1dfe0f6836064fb465a96

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