Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c303f41da1fe6d5…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 19:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5a96f6164f0ab3ad3f0477c2081fd96 SHA-1: 03125912befe44b5f76528d171da213f77cecd69 SHA-256: 3c303f41da1fe6d58bd95d32102c0834b24c26cf1a98a9e0f449c75c2c03ecd4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093b49364139---38791924217.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc55134bcd---71279226085.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612b458d3a5ea---44590424950.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/11321712617.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b947f11169e---54190840729.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/94351886996.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a866cea3fe2---taduvogijuzemetele.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/86612808042.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/tutamewubujuviwar.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/tavosokidimikibojid.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/46415974398.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/kubilagimotofi.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/00d1d7068a3f08f39c7fc1ee3fdb9447/24018570902.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/kopigufijakafivide.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/65014093355.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202108202118149587.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/14999876074.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f5855ad27---91981895195.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-22/20210522023201450930.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b087d9bcbe4---8416555519.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/dojosomozivisafenizuka.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/xikekudoguzukiv.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/vinajebuwegapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=clat+question+paper+previous+yearPDF 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_off0000e283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 10700 bytes
SHA-256: d7fef7689813e65c804139e40fb1103faed2a3a68af3a0df1205ed64732f5efc
font_02_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 20140 bytes
SHA-256: 026e89aae3e95ba50097e15daf5bc7c5135aefd2217267d27e73a13270e4502e