Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b975b7fff8b253…

MALICIOUS

PDF

77.9 KB Created: 2021-09-15 09:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4cde94f1e04714a641c875b649ffc28 SHA-1: 28b2c2c01e929889bfde4ac05107f92bf690d56b SHA-256: 98b975b7fff8b253230c1446c319e953aae42145ebd671909542fb3bd8f4b644
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are part of link farms on disposable or compromised hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicate a strong likelihood of malicious redirection. The ML classifier and ClamAV detection further support the malicious nature of this file, likely used as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://nomylo.ru/uplcv?utm_term=free+piano+learning+app+android PDF link annotation
    • http://cdmatik.com/uploads/file/29273583032.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/nadurawufir.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/44947600141.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/92532915560.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/52103910885.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/kamerudovinofiniwu.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/gafilalubajuforanet.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/46905803488.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/88038148713.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/de2597da1d39cebca78b582474a22005/58306993635.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/tukepomuxibebize.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/6934882609.pdfIn PDF document text
    • http://linza-market.ru/upload/files/37799079029.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/95963482409.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/40643773859.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a6mg9pa617fpvj7tgrk6qsd1r6/55676385202.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/62869189911.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/zevimososuxeju.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b9603033---puwegejagakogexafexezi.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/42157061141.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/5219451148.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/59541323648.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/cfcae1j5ejo1279v1eu3iuu2jp/83619255602.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_off0000cdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEC 17556 bytes
SHA-256: a17fd413d0fc239823bb37c97d79e5542aa5e3292bb1f264d94373c423264ee0
font_01_sfnt_off0000fb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11329 10276 bytes
SHA-256: ecefe2310a42a5d5f418d04ddb84082e0cc35bddcdbf91007e9513f7689321fc