Malicious PDF — malware analysis report

Static analysis result for SHA-256 39453807dc7269b2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 14:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a242e9797e90e6f4b383dbb48f0aac58 SHA-1: 13ecee86080d36df44a7d80a0968eeeedd236a43 SHA-256: 39453807dc7269b2e28e6aae659d5a51513c613c81bfa9c6f0f4559849d24b66
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution scheme.

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://nissanotogovap.com/uploads/images/files/39542510487.pdf In PDF document text
    • https://alamansyria.com/userfiles/file/govalel.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/17030587728.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/bekebeduranuj.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/86033216569.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/bc4d03c4fc10abcba587fde2917f6aa2/71653446676.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a0586b404d97d3f5b4672da32ae2acfb/47291015843.pdfIn PDF document text
    • http://dentherapia.hu/files/file/wakabubapimutokuzama.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109020620436251.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/33556592037.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/2070026055.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161471a1ba2d3d---82754833680.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/62876400126.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/dipozoligo.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/rarufogawaximozox.pdfIn PDF document text
    • http://healthywithhart.com/res/file/6022985805.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210915191520.pdfIn PDF document text
    • http://atek-ent.com/upload/file/62233776768.pdfIn PDF document text
    • http://laduses.nl/image/file/83825125790.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/70086008796.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/33583061154.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a792eb14322ecd38713312e9b7caff3b/nazodaku.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/25207229142.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/2109428448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+calculate+distance+between+two+latitude+and+longitude+in+javaPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/safivejat.pdfIn PDF document text
    • 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_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 17612 bytes
SHA-256: c58f1cf06447ad81c13633cbbc3c7bc17720a0a34a0f7e338e9c6e875e4008ab
font_01_sfnt_off00010978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001218f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218F 10956 bytes
SHA-256: 01994508dc7fe9787839cd29a65d58f1ce07a6bb57b50e27d644e1d2b55dacdb