Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7f133ad70e4a23…

MALICIOUS

PDF

84.8 KB Created: 2021-09-21 19:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d330e990815dcbc2f2fc2d6625a94031 SHA-1: dffe761e214801693affffe2c8a5fee109a285f0 SHA-256: 2d7f133ad70e4a23ebb6b4e85707fe63fb94e774c7d23534a313e180c6359d12
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised websites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of numerous external links suggests an attempt to redirect users to malicious or phishing sites, likely as part of a broader phishing campaign.

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 http://jia-longsofa.com/uploadpic/jialong151126/files/202109190012553814.pdf In PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/mibur.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/58105391978.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/tudusikojiritojivomalo.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/kozuso.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/77753046435.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/musamomapibegewaza.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/xopawogo.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/kalugiturogomutijugenigat.pdfIn PDF document text
    • http://sswjeans.com/files/49974812275.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/dilubozasumusefatipeduka.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613905f71af9e---saborunewibavubitixakoz.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/567cb90439de5edbae9c299e5f83935a/11165837944.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398589b5fcc---90836409498.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0e9386d14576a315ce57868ed7ade59a/98783483387.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a236b76cceaba5ca03d1d5d89c9ceebc/fivuvun.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/50032871563.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/wibikamenuboxululogakob.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/zarixup.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad79bb487a---guwululuju.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/jexopibewipuririjizut.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16140d623b4bda---rotosomunonazi.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/zopapabovobutodi.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/12597075841.pdfIn PDF document text
    • https://kapefashion.com/files/files/vizotagijulerenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=internet+browser+android+tvPDF 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_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 10436 bytes
SHA-256: 70cd19accfd04202bda223a2db8d8371d55ca50dcab1170bcddc5efcf942baa9
font_02_sfnt_off00011744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 17628 bytes
SHA-256: 5cad12fa6c7e38bffb9fe2fe56422c15e540dbc364205ac4b494fde5e7f6073f

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