Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd1d390640c4a34…

MALICIOUS

PDF

89.0 KB Created: 2021-09-12 10:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 24e5c0f5fea69f76ade5624fa6efdd20 SHA-1: 0f22d4254f39df04db4f1d68b0ff9cfdc8f43c56 SHA-256: 9fd1d390640c4a347996bbbd3cd6f815d6e4e711dda9a7de326696806d41a513
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a machine learning classifier and ClamAV, indicating it likely contains malicious content. It functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://3mfa.com/images/editor/files/23052108756.pdf In PDF document text
    • http://liily.jp/upload/file/20210902052644.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/tesagesatixazaronaxuleg.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613002c00d2bc---sozusovetugodexog.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c9867d0cd---ketusutazenobosara.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021910322406087.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/kimubisi.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/jenovimewavin.pdfIn PDF document text
    • http://apart1day.ru/file/43133473339.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/2581fb19065c8099cc861687c73972c1/tagetinorinuleleda.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/31052800511.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/sojurozogi.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/zapino.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132db473d57a---gelifejurilupemotik.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/94693105390.pdfIn PDF document text
    • http://becucci.it/userfiles/files/78965319191.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/76139915864.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131038346809---48650763138.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/nepatirefexabilozu.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/29684634784.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37623667635.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/81404941663.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/wilebizedekibolevugo.pdfIn PDF document text
    • http://boldogelet.hu/media/45121548104.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/94513102267.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/97704097252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=swades+movie+streamingPDF 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_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 10772 bytes
SHA-256: ec2fb57657be4e45f3d6f48b18393705d3f972e6f60041e56ddbf25a2e004e2a
font_01_sfnt_off00010efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFD 18220 bytes
SHA-256: 4a8675e1533990c003cde37f87574479a7fd956bab1d6b8f375a6d92b8edeac6
font_02_sfnt_off00013e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1