Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2209d5b137f2b5e…

MALICIOUS

PDF

78.4 KB Created: 2021-09-26 23:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb1e6483075df0038f43e7a3a524b982 SHA-1: c6656ce49d79c1f1158ddb23bc55824bc987c1f8 SHA-256: c2209d5b137f2b5e1f81df840226fba4824dedbce98d726e97fdd464b92979ce
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134310491235---52691888190.pdf In PDF document text
    • http://sro52.ru/uploads/files/lefok.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/53065958915.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/mejupulovozela.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397f71b1aff---47500437777.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/rimirupolodovetotozexema.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/45098384907.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/juguwepokek.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/42381130201.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/70740643116.pdfIn PDF document text
    • http://prosquash.by/data/wures.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/zufowimuvaviwa.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/62401650554.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/30116833332.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/fiwapog.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/95006527381.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/54712608968.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/42767272220.pdfIn PDF document text
    • https://scalping.ir/data/files/file/81618147515.pdfIn PDF document text
    • http://jonme.net/ckupload/files/jolusudelufa.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/ruratika.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b80f3d2c42db1102046e39dfdfd12ccc/nivavonugejexonokozopibax.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/gusoxixagadunoseditavub.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109162134439847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=probabilidad+y+estadistica+schaum+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_off0000c60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60C 11136 bytes
SHA-256: e80cc7f1473d7a7d84b6f976b388e9654fd3a067bee78a635f010701adf36957
font_01_sfnt_off0000dfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 19760 bytes
SHA-256: 2285d7ef5ee993117f6f067603cabb46b999ea88a7a7e24886b33fedb51c296c
font_02_sfnt_off0001138b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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