Malicious PDF — malware analysis report

Static analysis result for SHA-256 39023528d68e4631…

MALICIOUS

PDF

87.3 KB Created: 2021-07-19 01:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 357fc40c08fb0f0a0efe1af91a080367 SHA-1: 48d54937dd1600cbb4b6a5dc581736d16398388f SHA-256: 39023528d68e46314a4e4bf236856601d64dc17153e78929f1705613694b7ed8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure victims to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://ciskmv.com/css/file/92977441904.pdf In PDF document text
    • http://thebrownbag.vn/upload/files/bedudorepimatemonapujeg.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/mozoxube.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607563cad3cc1---23059323515.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d19fa7e7fe---wupalakugojadurorap.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff6ebab00---bipukezutodiwes.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/logasifisapolemav.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c978773678c---4347472163.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/10984685593.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/xuvetaxadofemiguw.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc50c62a8e---57088169044.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/6cc1d8163e0b8ab94e6bee0ebffc1ea5/38835655285.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/15137667760.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/24187368873.pdfIn PDF document text
    • https://x-software.cz/data/file/35941759077.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0371b054d---kisar.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/banewodukumudadomojumoxi.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/15883757329.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/82e983fec2ed89c17ea3f6d4fef4bc57/sodaputatesinujipeb.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/45504c3c53bbbc5d6210df2267d49462/dixamerusov.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/kl0gj10hi9mi4hg68sq758qj50/zakufe.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/gupofoxetotazez.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/v19eutsdnb9jvsm2cocbjrh497/99074168732.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/1638guovon9l04bp21qhvm3uf0/pegazafujifufenafijatase.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/2519473d9a16f448592f45d00d41ebc6/vodutodukenoba.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608602ac6eed2---simumisorisujamenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=river+flows+in+you+piano+music+sheet+pdfPDF 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_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 17436 bytes
SHA-256: 34fabc2648081444a9c4cc93c9de8152e49a0c934b3b43f9b3015436a243cbf7
font_01_sfnt_off00011d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D39 11296 bytes
SHA-256: 8dfcdcc399e94143864a73e9518c34b0c65c79d18e8b437634556114fbd8c25c
font_02_sfnt_off000137ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1