Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccba4fd8b8673517…

MALICIOUS

PDF

82.4 KB Created: 2021-07-17 15:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 392e5b65d0decaa1c7d0686623a4e213 SHA-1: 7416f51553a5068e7042190f24ce5495206125f0 SHA-256: ccba4fd8b86735171d9c39e87d8c8e17ed54b51503fa0dcd24c4a84005407cb6
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised sites suggests a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a7573aaae8636739823a89dadf821a70/35487720525.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/hdcsfpcoi6jed8ljt6gjl702aq/65070191822.pdf
    • http://gmicropilotes.com/uploads/files/puvoxetedomuxawakupuwosu.pdf
    • http://119hero.kr/userData/board/file/vised.pdf
    • http://lungshingcentre.com/userfiles/zikamorepusuginetusowulo.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b293b56b67a---76834409725.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6155b9f0---xinoxovif.pdf
    • http://thetestmag.com/userfiles/files/kimedotarabinepa.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5523a6928---dugapavaxejo.pdf
    • http://nesthomes.in/userfiles/file/bolojeg.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/84fe860bd8ab2be34413feae8d219195/67462786597.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p8l7b710kpvllav0dhhpimb9k3/85009837947.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1d59e250e---vopefokugulibuxo.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d232027a1e9---tusinovubatamijef.pdf
    • http://teplospectr.ru/images/files/72982886607.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/7udiuo000kk4ekgl6gfbbjeg2e/xemamibosugajuvevuk.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/4h54d4iuip68h4qn6e85iapk98/95975084545.pdf
    • https://e-ceramika.pl/userfiles/file/92924571578.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/6a16980b7fcae6133a32e081626da3be/pulutesosi.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/e0g6r8bsvj8ki4i7tmd6vg8qr5/fifeluruxudireka.pdf
    • http://fmi.lu/userfiles/files/54200424010.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092a7316e2fe---44052097486.pdf
    • http://akinmedikal.com/uploads/file/70975295810.pdf
    • https://vmwarts.com/ecovic/file/10670296666.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a98e769d6---93598237309.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=vba+out+of+stack+space
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c881.bin
9f081613c0dfd00972d523586a55e60decddb2c82dcc27e547c6329784df0db6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC881 17352 bytes
font_01_sfnt_off0000e26d.bin
097112a82fc4436d6b09fd5174a4cf91ee59d21e5ef95d779c1ae8f35209f858
pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 16072 bytes
font_02_sfnt_off00010c00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 16792 bytes
font_03_sfnt_off00012417.bin
ff1189302ad7a8033dc9ef5ecc4465a5c8d659c92854e5be6402f08229be8e94
pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 10432 bytes