Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc144ebc168ac6b…

MALICIOUS

PDF

131.4 KB Created: 2021-09-08 12:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6952f269adc4320a0e5d1612e81ab80d SHA-1: 47b0dd1bd64514924bf47f7b659395964394bf10 SHA-256: 7cc144ebc168ac6b194adde26567fcc7f279af6e9b660f44e83fb1e5a9d12eac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=hospital+management+textbook+pdf PDF link annotation
    • https://leosservices.com/userfiles/file/mizesu.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/55109300359.pdfIn PDF document text
    • http://labsshop.com/d/files/retanapijura.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e63937e4b184787e416a2cea36c768b2/sefuwevadajowatewafamer.pdfIn PDF document text
    • https://tierlistei.ch/downloads/degib.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/40483919111.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/23211389847.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f56ab6767---wozenuligexolanirudimugow.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///48326423511.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/merovoputikopalefareba.pdfIn PDF document text
    • http://a-pluset.com/userfiles/dixitebemi.pdfIn PDF document text
    • http://agilesolutions.in/uploads/zolirimu.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/27261007034.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161348ba53b0c3---9194646249.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/fabikujuvat.pdfIn PDF document text
    • http://datcat.vn/2018/file/zipanig.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210905_142645.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/24169793804.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///giropemotufowiji.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/jisaredomegasarixaloxuwi.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/45820573821.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f627b8fdd8---44628484078.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9ec658ceb79bc40ad1072a784921fdaf/laxinotidugurujajiduli.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_off00019d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D67 11064 bytes
SHA-256: eec7d8fc0f558ab31e6eaa091f688bfe11e2f835c9cb31373500fe6f8bda71bc
font_01_sfnt_off0001b6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6B7 18588 bytes
SHA-256: 7c6db4c119a423c14ac293492682b18f06282afdc31284a6b8a42d43826017a4
font_02_sfnt_off0001e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1