Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f07fd753813ba57…

MALICIOUS

PDF

87.7 KB Created: 2021-09-03 03:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a41eca9eff27bcc8baacf9bab16934e SHA-1: 4ac253570d1c92d88a6b4e4fd19f0db149011ebf SHA-256: 2f07fd753813ba5765355ab66ef16c589b757a0a5a4add6450c563d686ce7d27
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://jjcfurnituremaker.com/userfiles/files/kazewon.pdf In PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/goxunegolapoluduxo.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080fcc18d450---19337288889.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/spk304cvkqcgs700d05dq9ihb2/7696657188.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/58728490299.pdfIn PDF document text
    • https://digireg.dk/upload/41176186376.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/123e0643a9eada37e5dfdfc69e1139e4/miwulugifigokurixiwik.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/16037191392.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/xitonurosukesazijipez.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/gigebimawenariterigot.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/xagubobikelevoled.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607094d091ab4---90706355847.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160795f16411ad---wefewul.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/37900531221.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/cecb066e33ee99f0339a709433c6f18e/zenirumawinoxi.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/3753219425.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/12fba9a19cc13c2b873bb39148fb9496/fesevumo.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/mupagitex.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e0a688fd39c015bfb4c370669e79b32e/37148032005.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/14060458478.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ba0b8f243---92380729406.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/gigufenogabizazinoru.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/86201425258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=workbook+for+the+study+of+orchestration+third+edition+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_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 20976 bytes
SHA-256: 024cc9e41f9a34571cbb5b9f6c4da45d879d2c77843bab64b71d43bf83d2bbd0
font_01_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AB 11112 bytes
SHA-256: ab2a1395595867212768ef5d3ff02b1b9e08a063503cd60464d89be5223def95

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