Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92f670e2673f52b…

MALICIOUS

PDF

86.7 KB Created: 2021-09-03 16:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a421c1c33962b186786a3ea5eb21b63 SHA-1: f7d2c629408d2eb1389f9a8e7bc650848e64b838 SHA-256: a92f670e2673f52b4f3429577dcc0271ee61c76286efcb094237009953b013d9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript, which is often used to download additional payloads or redirect users to malicious sites. The document also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1ccd97d9b54230197b77654aa37b5c13/pobowizawodajixejukuduzum.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071f98356db7---83065601370.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/juzabebinotiwisaleguvi.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/77033194198.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95114250098.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/liziwezifi.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/liwawefosumefides.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a8da058d9b---lowog.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/tovedal.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/97146269931.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/31766665386.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2baab7809---7619285217.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/90713145915.pdfIn PDF document text
    • https://salwangurugram.com/files/31511347224.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1ca87268b---gixozawepokuwabivepoziwul.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/55951706405.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/75953608193.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ec96a517357ec45f932f54bdd119fd2f/97871368094.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/gusobifekuwamidenarag.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/84226272900.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/dimojinukawalixatusadiwi.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/8d519dc9b80c37a21419dd84924f2876/jafimidawasakujorexezulof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=organize+your+digital+life+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_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 17676 bytes
SHA-256: 5b7f215d387529cd029b2c2b66d425f8f9dd48ba773b126e5f6cecddcf3ee412
font_01_sfnt_off00011c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 10804 bytes
SHA-256: 73e011ade27f5abee1b72d221891d2c9551d34587a7b6f5f5df5b0b39599eebe
font_02_sfnt_off000134f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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