Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3a5643288ff489…

MALICIOUS

PDF

132.8 KB Created: 2021-09-01 04:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7e4e9b279cf64ea6c321d5df8b2b770c SHA-1: 616b4d6c4f8b4e7d63e9d5d51417117a246eb49c SHA-256: 8c3a5643288ff489f80de321b7ff38ee342a1cb8c84a1d265d3015d43053c2ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised WordPress sites. The primary purpose appears to be directing users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://philabc.ru/uplcv?utm_term=spill+meaning+in+tagalog PDF link annotation
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cd1a05cd1---84976780721.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/munilutavawosepevawok.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/l3c0c9vk1udm3vdestdt144e7u/naroteresenisanuxaniz.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/292688898fed5d281e08202af0b713a5/bojawosojawakede.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/58133639694.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/70760040408.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/ziligevubif.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ccb65789---20608171545.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/72450819778.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9aa5ca090c---18482804215.pdfIn PDF document text
    • http://megalaserasia.com/upload///devizajusi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0edf8846cb---16095698434.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/o1nfv7arn04oedgs13k6gq8bt2/28336440173.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a1a77017d---woravax.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7beaf3401---fepile.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/govosuzumofesibopapuxin.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/zuxetogejagudonipo.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/dojeniwupud.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/vogodom.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/tipugepejomed.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71509c4feb---ragegikupovuguxapawonoki.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021081010051580554.pdfIn PDF document text
    • http://teplospectr.ru/images/files/42222226645.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/zuwebomaxekazowuduwigun.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_off0001a0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0DF 19948 bytes
SHA-256: de9a8d73b6f42c128cb2afec32326f97dcca3e63d099cf1013fe1ca114a37d62
font_01_sfnt_off0001d5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5A3 10400 bytes
SHA-256: 995386e12e7b3813d4f5f6ae3672a6e34f19a198b1c563dd08ad71f83f8d57d6
font_02_sfnt_off0001ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1