Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecbceafc02a9b36…

MALICIOUS

PDF

74.2 KB Created: 2021-09-17 08:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bf267bccf0f2b2078f0fe640a1735db1 SHA-1: d619f61efb130a9963faf1c57b8fd86e03af5212 SHA-256: cecbceafc02a9b364b013662c9fbce034cab24f16f4d8fc24b9eb69474b7e883
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. This pattern is commonly used to direct users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://maintogelonline.info/contents/files/58122883159.pdf In PDF document text
    • http://thecargonepal.com/userfiles/file/tivat.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/rudutuwirawom.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/xarunaxad.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210913132005154.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/17906739032.pdfIn PDF document text
    • http://orthodoxnews.us/file/66725179215.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/negevekanezovomivugugobob.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/tujizametudawixasexaso.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d6d7e2923---86650222604.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/37768229851.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/xalulenazosoxesebazesogak.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/85787300273.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/70693651131.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/bisonivuwes.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630754000.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/63686098229.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/vonitewup.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/belimonowozedofos.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161373fad86fa0---gikofuvewalaf.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/49283318753.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/xopirewizozilo.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/89698123351.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614099f9d7a35---xiwumaxotepelukizexivik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=connectors+exercises+pdf+with+answersPDF 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_off0000be1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1F 10892 bytes
SHA-256: a2801c18389b115eb766434a46c38b2edb736f336394195528de472b7b9b6ba0
font_01_sfnt_off0000d762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD762 16884 bytes
SHA-256: c372eb0aaa76ba7c57202bc93e46f194ec345db438053f0a7b8eb6ca5c68f2da
font_02_sfnt_off000102f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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