Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b2a8c0e5f893e8…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 00:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 31360267e2f91c962ea021bf8ce72fd7 SHA-1: a4da4a232621b0e0633fa0404485996b9c3d0f7a SHA-256: 74b2a8c0e5f893e8588cb0e5a67428baa90f7de583ee4ee27a17b513d9ab3914
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to mimic an invoice or payment request, encouraging user interaction with the embedded links. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ML classifier and ClamAV detection, strongly indicates malicious intent, likely leading to a phishing site or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://catamma.ru/uplcv?utm_term=income+tax+payable+cash+flow+statement PDF link annotation
    • http://christopherdallo.com/file/zisolowe.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/83cf9575c70c7a6ca8121b75432bdf83/49275490969.pdfIn PDF document text
    • http://all-premium.com/user_file/files/xewotinerazedeloxog.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/darufap.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/41804728113.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-8-29/20210829211003213308.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103812715e42---60192986140.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/28407190887.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/sivujiw.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/40445134005.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/zogufitomotelaxa.pdfIn PDF document text
    • http://www.heksan.com.pl/file/53494012187.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0114b6c69264235ebad092ba5e2ea8a5/41177229867.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609411361fe42---59774131869.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/b0pbldfarb9tqag2ktm12jos8a/88783253635.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/93183785498.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/59910606878.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/7f5c11141b163d8915392fe7f7b3acf7/wukul.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5f0c15216---53104162204.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/vulononofit.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/3086428299.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/56928468865.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/75292228809.pdfIn PDF document text
    • http://prestopc.it/upload/file/mazisijetimovuxoponakexe.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ed63438db4aaac7d3e6b608a89edb9e8/82963575388.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_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 17804 bytes
SHA-256: b16814745667d3465882d950c733150452d47287f8a621b4915a069991d2a802
font_01_sfnt_off0001074f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F66 10944 bytes
SHA-256: dfc3e878aceb8d9894b03c5962eb2c5bc8610d71bc105617b11042aff2b2523c

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