Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbf6ab48481acae…

MALICIOUS

PDF

75.9 KB Created: 2021-09-18 01:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 601f95d3ef3fde84518af9d41f36f30f SHA-1: bcef0ed86584d7daa54b9f4160de2f9d47c0ab6d SHA-256: 1cbf6ab48481acae2a12788b57f5446bcaa1d3963b5f608a44c4f16738fbc20f
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The presence of 'utm_term_redirector=True' suggests an attempt to obscure the final destination and potentially trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://shipnhanh247.vn/asset/files/direpojisigiremizimosagod.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161381e67481f7---96139625543.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130d0575817c---vuritavep.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/87531487566.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/buvafikamagujunupewaxoti.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141655414eed---7859796187.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/27888239349.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/kibibekosali.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bd583a08d.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/34704203930.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/gilunuxugidukuxa.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091104415355.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0e6ed7245---14178834071.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/0a2c28e17dc6c0edfb37da003093f194.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/xevaligofutexukufiripukiz.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/buwedudafimak.pdfIn PDF document text
    • http://gapp.fr/medias/files/71275797489.pdfIn PDF document text
    • http://carszana.com/image/upload/File/daruvenuwiposujujidosoko.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/detanugogofepipunimof.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210910050650801.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/zidadejaluvoxigexugob.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/15006263144.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/xowugagakojalukejoxaga.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219724112591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=network+marketing+pro+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_off0000c3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CA 10780 bytes
SHA-256: 5a80da6a11d770d7c86680c282569c2cbe9063721d7a7c01b4697b7138a2b4dd
font_01_sfnt_off0000dc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 17484 bytes
SHA-256: b3135e31602906276071b968cf297e0534be68236c16c4d68ffffe6420fb7d93

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