Malicious PDF — malware analysis report

Static analysis result for SHA-256 6890c1970b8449bc…

MALICIOUS

PDF

77.4 KB Created: 2021-07-09 05:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 90d657e7bb19e9898333440e610875d1 SHA-1: e37812ed729c132cf4a088ca17a9f9b70616d1b9 SHA-256: 6890c1970b8449bcd7f86d7389ae39f6eebf4404fc4ab845cbee2c2fb6e41648
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF's structure and embedded links strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://standardpromotion.com/images/upload/userfiles/files/56324873257.pdf In PDF document text
    • http://brenna-ski.pl/userfiles/file/42303443089.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/ferovupiru.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d6e86894---88657653561.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8cc9bc271---wadefer.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/42012233414.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/84832425467.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5b5ml9nhokb021vof8jb3clac3/vavezawa.pdfIn PDF document text
    • https://lasanisports.com/files/kasumofugabiwabufuvere.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/karobesiraxobovopumet.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/sexomefifukojixenigakid.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/96956050054.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/87168795106.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5f54533e9---92046836565.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/er8r4a2cvdki7h7lc4ohcvq2ae/2214113332.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094056e04afb---wekosajodikugawi.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/puted.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14848fd17---83728331985.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/zawajavapanofodara.pdfIn PDF document text
    • http://suttonoakfarms.com/clients/880813/File/24813099531.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/limefasasodeturi.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/eb6d7405937b8cebfed30be2af1911c1/vurisanukogakigo.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bdc871778---50905883846.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ccd21abe5a97589f17c3ce660ee1ac21/49226654678.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/847e6b5dc515c8aa5934f469860e4f38/lafuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=session+1+reading+passages+answer+keyPDF 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_off0000cac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC9 16984 bytes
SHA-256: 4fd03443c78bf184b14a2754443e1d546b6e834dcb9257ca42971fca1c3c9624
font_01_sfnt_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 10840 bytes
SHA-256: 2f6dde582ff4543c2e36256507a08cdf007c550d7652f47479a5aa9f26b2a5ae
font_02_sfnt_off00011007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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