Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d922811758b126b…

MALICIOUS

PDF

68.9 KB Created: 2021-09-02 23:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f567a0eb4d3c742c3608680576c99200 SHA-1: ad2894222628a1e679910fab7c014ccfbdcce256 SHA-256: 1d922811758b126ba9b7dd3bd2fa68ca1121c932700ed6e97354a8e2987fcf9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://ahchala.com/img/file/digeroxude.pdf In PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47489075470.pdfIn PDF document text
    • https://emmaushuis.org/pages/97055525077.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/zubikagebifagavodupo.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ede96f16891---kixugobixe.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/2108212221133838488zk41.pdfIn PDF document text
    • http://leancenter.net/public/default/ckeditor/files/vufewufub.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/89873454625.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/q3edfrrhmac7hl0d5kfuel1u17/14022470289.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/20702406521.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd6535160---fajovusiratuneteneweni.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6b1b5841b44816c36f9c17ca2c8ae996/79428747754.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/jufuzewilukalikuwem.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/45294470128.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/xuzajorunikez.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0c56273bf---mogak.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b1034bba6a54c190da00bcd0221f704f/mapojadexanavujazat.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/xizubasojiratepivulun.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/a41nctqh05s994c04n7g2ng7ke/15802420828.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/rutaxawonopovi.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/75177846686.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/wipexejokejozulej.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608889f890d32---jozabasominusabomes.pdfIn PDF document text
    • https://aedwea.com/upload/foto/kotugiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=adjectives+list+with+meaning+in+spanish+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_off0000b144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB144 14248 bytes
SHA-256: 3474b5315839a31d3d672a2e32397ec0461e7271509e1774416e5ed13d568225
font_01_sfnt_off0000d46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 11112 bytes
SHA-256: 79f61c872983b5d77fc0ce22d23b2d51eceaa2629b73edd1daee1a87a6170d3d
font_02_sfnt_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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