Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1800d756194659a…

MALICIOUS

PDF

72.4 KB Created: 2021-09-07 18:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3a2dd97216e0a622947c49cca6c5a09e SHA-1: ff1f3f11b6e5853446036cfa8ac3f780039a3a73 SHA-256: e1800d756194659a1737bb632cb32d08f1f732406100b65a9ad284126ff49359
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and a link farm heuristic points towards an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://eetravel.net/file/lizosaxafegij.pdf In PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/28d7f48738ceb355a9cbc32a81c0aa4e/xefalusatam.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104211b8e1fa---27740420453.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/imtqb86pkgkvhpnntq6jedjjp6/53919886610.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/20701837074.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/loxaxuwanapopovoromaxi.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/lufogiva.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/bosimowabuzalonumukax.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/wobokonulajadek.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/6f418c1e87ead38d76121ea88c4507fd/losul.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4bribi9icvkrf514el3dj94hfa/gomonadabeton.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/pivibojimi.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/55238765554.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/dutikal.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/vagamivasilizinifukonemo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b4ca4f235---pexivekupimobaxajenoxavo.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9bc970e891273892a46569d65c6f313f/10834032965.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/82810686104.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/8938800292.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/57104381171.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/72262768075.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/456cd4d7d0644d53a2a1f4e5607edb62/52768236893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=percentage+worksheet+ks4PDF 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_off0000b703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB703 17472 bytes
SHA-256: dc06720155bd5386349adaabd8414b42b8fd32dd4285dbb3d416f482b5966fc8
font_01_sfnt_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 10628 bytes
SHA-256: 033eae32f046b98ef8f690508dcad48f61629d32ef6fe982cf473cbf519f6a5c
font_02_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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