Malicious PDF — malware analysis report

Static analysis result for SHA-256 a406c26b2b69541c…

MALICIOUS

PDF

116.8 KB Created: 2021-09-07 19:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b19c5cd166a24e9ef391c534b7549463 SHA-1: 53351abcce9f8781492f7ab4d9d0fbfaa8a6277e SHA-256: a406c26b2b69541c49d9df1fc88ba01d0d58850c6a53fd60732d19a2ddf4a3de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f556c1512c5b7b607afa4e873454ad11/xidufipiroza.pdf In PDF document text
    • http://cmsrecuperocrediti.it/images/file/kajutigoxukadex.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/12659328442.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/77437097697.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/53v4k1vitnvd6618684svhmiec/jizenuxenifopiz.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/70c2q71d84olbhi5dp8qn00bq2/93559722675.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/26037485963.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b652970fd40748754016bb84f90550a9/78393836319.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/pukogerumoxubalal.pdfIn PDF document text
    • http://accronline.com/userfiles/file/soduxadibibepapibopodij.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c8fe85b95---xuseduduzejebodamagosiw.pdfIn PDF document text
    • http://altinay-law.com/images/file/53154779010.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/12314877709.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/87082096960.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8f40f0c04be0365f716f8636e32a0e6d/21517563121.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/18308b0bd490efd3c36890e6dfa09afc/juvelemolijuruvux.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/13979c52627b8c75b99a2c4cfa3ade3a/zunikinawajasukuxisotiziw.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0322d91fb6---somuvanijupojonafux.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/buzojipugofutuk.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/matenivobilizev.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/58131556451.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/6159ecc4c40287d2c12a7093e87df043/66896836802.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/46540720345.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/60271362643.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce34a22230---20322257496.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/pkrmamo72gh7cns78furht2ao8/litebademuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=estrategias+de+ense%C3%B1anza+aprendizaje+julio+h+pimienta+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_off000159b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000171cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171CD 11424 bytes
SHA-256: f1076b6932b1b398800dc591a274c3e0aab4c9555caca127d91a3e97fc384388
font_02_sfnt_off00018c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C0F 21196 bytes
SHA-256: 6abbff388520ec8b73ba2e63d1e80e75c2716278e3184f618164bdd468b6b37a

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