Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78895b60b1d1087…

MALICIOUS

PDF

91.4 KB Created: 2021-07-26 06:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4863cbce972e856e78c91de1530e3db5 SHA-1: 1f9579079db5853e4e9ed1eb53261f7cfcb6b46c SHA-256: e78895b60b1d10874faff69efea30df960c962542a73b2648857666814e53fff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. This suggests the document is designed to host and distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607957ff5acde---sogepetumolajixu.pdf In PDF document text
    • http://studiolaviano.it/userfiles/files/16141460294.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/28708800766.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/lotajodusogeb.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mn8qrpdv4qssllj5jvigbtorvu/5787995603.pdfIn PDF document text
    • https://ptogel2.com/contents//files/minojizalitid.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/41576731443.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e6fb0355d8dcb371eb6db7d0839c3b5c/muwijunokukilak.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/7683829323.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9100bed886589d2b6cda42a56efe3ad4/66886988947.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/afc6df2e4916b3f45ba7bd58c3c844f0/80101095595.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a16d04cc4---91597006408.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/18042315170.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/71328951144.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/6590911149.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/89674963600.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/86888961767.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/rixebedigosazuwib.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/vhbatv2eho4ip2phbbjjl3jvd1/69413501205.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/487b41b809a3df08aed02769a965cee0/43913877851.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e3dbe9b7b3f---97583762184.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a7816aae2f5---vaxeku.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/8642830814.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/gemifuvelonaxuleta.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8ad0a818---37150388930.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/lujefejupaguxenegisewalof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+stop+a+writ+of+possession+in+californiaPDF 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_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E8 16884 bytes
SHA-256: 14e5461ccebee99cf1aa1bdddde3111462f34b9248aa208f7e4a62928b219048
font_02_sfnt_off00014604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14604 10552 bytes
SHA-256: bc2a0688128cb1d9747a7b5dd9afe444440a911d24beb1ef6df5fb8e5f06c0d0