Malicious PDF — malware analysis report

Static analysis result for SHA-256 87621c997110979c…

MALICIOUS

PDF

96.8 KB Created: 2021-09-04 10:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef478ad1a3e4589f4695147d7552544b SHA-1: ed2d69360676c947f875dc88fc338f9bd4e283aa SHA-256: 87621c997110979c13b51e4e864b4d5647dd01ca7989792a39823be598d2b1f9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or exploits, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/d848911b541770c6ed75590bcae2cb05/9543921420.pdf In PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/fcol3uhsbbpbjsqvi2d2nuhgr4/pajixadifexajonuluxit.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/jajububatikewole.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24266248e---16384790972.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/91978318368.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/4b7a2b1f03b7399c498cd9977418731b/91931411204.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/83627421359.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210720103325_f48ke0.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/73266786946.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0b88275e03c006d78e7c0adca037e604/topuf.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/64900421088.pdfIn PDF document text
    • http://mobitransjogja.com/files/lutoxeruwanuzasajelosodus.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/13392066963.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c9554a5055d---17644880167.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b5122837---83764816460.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/99075763728.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/b0o9k3jpttoq0gbhsrofq5lir1/67686947086.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b8f4c493c---32711524824.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cf862c6b08---zixawolegumimeja.pdfIn PDF document text
    • https://quangcaoxetaxi.vn/upload/fck/file/vezile.pdfIn PDF document text
    • http://glcore.net/ckfinder/userfiles/files/38442493630.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/8f15fe6b5fa46bcc773fc696ce6c7d2c/6087631248.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/potivagiporisasikovor.pdfIn PDF document text
    • http://philboyd.com/pefoviromaregorelepolajoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=desh+bhakti+natak+script+in+gujarati+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 20836 bytes
SHA-256: e28957a98259f9f30c6cce84c1345cab74490fdb3be9c360733329736be0e6f8
font_01_sfnt_off00013b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B28 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off00014324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3B 11196 bytes
SHA-256: 07094ff34857eb7ee37a87c60041823cd44ef30917f4ca9555cd08e05152afc1