Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97ba97a512fad53…

MALICIOUS

PDF

100.4 KB Created: 2021-09-04 02:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43e772d37f2d95c14c01f6abe109e5ef SHA-1: 676215505ae3c187699ee3b21abb88b9f25bd6fe SHA-256: b97ba97a512fad53c4fe46cb006cb3549c76bd90ba5dc81679b924017fa85861
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Numerous heuristics indicate the PDF functions as a link farm, directing users to various external websites, many of which are hosted on disposable or compromised domains. The presence of multiple external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=qualitative+and+quantitative+analysis+of+phytochemicals+pdf PDF link annotation
    • https://advik.net/userfiles/file/zaferurufuzex.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/xevogasofafo.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/86028737115.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/sezimagej.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/guxojegelexujuzabupogira.pdfIn PDF document text
    • http://bjjiffy.com/upload/vekewagaxeri.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/55182251958.pdfIn PDF document text
    • https://businesslife.com/content/files/zokekobobazofesazonered.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/649faef6e2c62076b0f16d5a9209d9df/gowowilusulepefi.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/50744537877.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/857dcbcbe902adf6870304e0c9999492/23929260068.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/rifuzu.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7738010fab2a66f982c117b85d5b674c/roxewukimibusowalejupi.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a619c6bce---81852904244.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/rikiwagefe.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b5f203f19---86430694406.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/40749004619.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/76odlakirchgsh20rusohdulu5/54034663824.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/fd592cf7c6d0009411e3ff9dda32fc73/babaxo.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/mjekg2mvgdtd0e2j10ajk5u4n2/xikigaguzunido.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9d01b5bbf---18576640705.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/latokilogomamujeparenav.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_off0001204f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13861 18848 bytes
SHA-256: 383776d7c8f38bbec3cc2f2adb0619b1f93183816224504865de22352063c706
font_02_sfnt_off000168f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168F7 11268 bytes
SHA-256: a3be86639f464844da99404f406e534bc544c9fffa50d0a4321b372b5a9448a9

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