Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f5bb00240c4c6b…

MALICIOUS

PDF

97.4 KB Created: 2021-09-08 13:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6dc05d22076724c566b77d208430bbbe SHA-1: ef856192541a39658d19fc598626245da4136f65 SHA-256: a7f5bb00240c4c6be1d3b41fdfc60c664f690269acc680ffacf87bb48fb49ec7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous external URLs, many hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://immobilieninvestors.net/userfiles/file/3700021172.pdf In PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/18486553948.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/68827335479.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/vosetederixezavakopiv.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/66800074580.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210905/file/furekusejuza.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/98580242864.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/66283700008.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/4707f97ccb0ed376230013d33a56cd1e/23101216060.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/cf63e11ab8481b94fb23265a00be2c43/52947139197.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/95196821229.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/tapuporada.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/wakamuram.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327550c6a84---xixoxem.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ca70c1b76d5cebd439907eabf1f17adf/28092711536.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/46697954000.pdfIn PDF document text
    • http://abnicum.com/files/file/kizopawupego.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/83214699084.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/xewejajaxajugerabu.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/95127129668.pdfIn PDF document text
    • https://alariel.be/userfiles/file/sirugosuma.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/95967339569.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/voveviwezepola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+android+pdf+reader+appsPDF 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_off000118b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 10500 bytes
SHA-256: 1240232ea1ea6ecb123c053832fe1449b3e1445840cdf22d48283173ba598fdc
font_01_sfnt_off000130b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CB 18172 bytes
SHA-256: 0aa6dacb5a6d607da7aadb8258bf27bc9cae3408bdba53621d807cc78a25a47b