Malicious PDF — malware analysis report

Static analysis result for SHA-256 a407c36fa4400c68…

MALICIOUS

PDF

95.9 KB Created: 2021-09-14 10:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6dd9bc069c2219a35f121d4bb0057284 SHA-1: b19a47689cdac34f47b933b8f9430a9dba9548cc SHA-256: a407c36fa4400c68d5607a1f4557664708854bf72ca55d8fb016ee8a83dc7994
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to a malicious document designed to exploit user interaction via embedded links.

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://domusanna.it/userfiles/files/96200187299.pdf In PDF document text
    • https://tectrongim.com/uploads/file/31231674248.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gunabo.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/41597683871.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/ligitorabipofone.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613741351ed73---30364520521.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e68664d835---17946650842.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/tibinididiwokopad.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/lorumepubetifatase.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/bujazuvuzosafanelutowaxap.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/venukexopikebegaje.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613205ed4c804---80182466051.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613764348710a---tobavuvawagafofuliwe.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/38443210203.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/bizusumitil.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/kezawifu.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/2783383810.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/53376654598.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/zabufinubekexirade.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16136145245f2d---15420588217.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/vasesalosefurivuma.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6623abd5ab4ba3e920a58a29e18dbadf/kufawutu.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/daludarado.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6137b2dfd2904.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/kugupabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=m0bile+legends+bang+bangPDF 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_off00011411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C28 10360 bytes
SHA-256: e4f84d9da410776b7c886bdc4e8b74fc612c26f81d39cc3418416e1dee479011
font_02_sfnt_off00014366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14366 18016 bytes
SHA-256: db9d1eb9bb1e256df54ead8beb8ada4e4d849741f3cdd92763ffa08efd29e2e7