Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1438a7e999d8095…

MALICIOUS

PDF

73.6 KB Created: 2021-09-10 03:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2a9777e2b53531ac051aceb0b4ed3e58 SHA-1: 2ed75dd452a3f47fd904461e855df788ca133121 SHA-256: a1438a7e999d8095d37f4ded8fde84f654b36c1ace36b3f4e5673fdfde0ca37b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous URLs pointing to other PDF files hosted on various websites, some of which are identified as compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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://livredart.com/ckfinder/userfiles/files/ruvixunilusajaj.pdf In PDF document text
    • http://onlinetradeshow.ir/uploads/files/sivukov.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/84278048823.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/850c68121796666447520db8dccf405c/69863596056.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/13971161069.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/luvolikemezesidewokasut.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/8330215f41febae96bfdb59909f45203/digatoxizojubodopirupugen.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec6316256---31458220471.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/35453762034.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/zoxifawe.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7fd61d1ef---82987667772.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/9723596589.pdfIn PDF document text
    • http://bndweb.nl/upload/files/fuzamovemazuvugutodapa.pdfIn PDF document text
    • http://edituj.cz/res/file/mekudetozogijov.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/tavulixarilofonum.pdfIn PDF document text
    • https://hoalavender.net/upload/files/votabololeboma.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/19180994323.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/mebivebas.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/nivivoresogijes.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161345be67d407---pujeduk.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/gabobapo.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/dotilolajif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=my+mobile+pattern+lockPDF 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_off0000bc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC77 17284 bytes
SHA-256: 92e00e1e00db83ddcccec06cd8d58da09ce534d0b97273c62354379779249ebd
font_01_sfnt_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 10704 bytes
SHA-256: 00dfb59253c64daa25f4b68fde585baceb912fa4b6fe47d2f923f87a093d720e
font_02_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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