Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1525f58dc2c6fd0…

MALICIOUS

PDF

88.4 KB Created: 2021-09-02 15:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 411f07cdec8b3e0369b730a92c5190f4 SHA-1: 14bb9a0de1505725613e736747f68e31bdb06f73 SHA-256: e1525f58dc2c6fd07c98c5d8ce62347e43936984b6ce183ad6c7de7f98fee168
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress upload directories, further supports a phishing or malware distribution vector. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://shiphangnhanh.net/uploads/image/files/81096051526.pdf In PDF document text
    • https://xuanhongkhang.com/upload/files/wawolekamo.pdfIn PDF document text
    • https://scalper.ir/data/files/file/defobitedokaratol.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/zavajuxifadoraforum.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/tilegejokegozona.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/8899ce58e301517139d9385741d4e69f/rawibapijefojom.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bba3fcb172d---73885698055.pdfIn PDF document text
    • https://ibextrail.com/editor-images/39161063412.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8f91cc4a1---19764345854.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/21470917223.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/widobekoripegakawet.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fd9e4b708---39421423685.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/16054556339.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ae8f5f01f4---lorebofugavebigibon.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/xelijix.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/boteteva.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/navesapigijakel.pdfIn PDF document text
    • https://kawanmto.org/contents//files/47045982202.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/38329048492.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16099df0bc2566---gobafofuvu.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/24589406003.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb6a43dd09---60430485377.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/webiragapowefufofasaleb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=grammatica+italiana+per+la+scuola+primaria+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_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 10920 bytes
SHA-256: d0ae0c60a21cf307a2f0c451b9bf461c75c24c3382a6479b46adcbdd16f2ead3
font_01_sfnt_off00010c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12467 18156 bytes
SHA-256: 24567853a90d46ec4636ae2fd2fa7bf0ee5219dedf611c0c15c2da0cfd98fef0

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