Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62882eeb737ad5a…

MALICIOUS

PDF

112.3 KB Created: 2021-07-15 13:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4af4eb047d9c113d9b89bf03a84f6f61 SHA-1: 14be781da8e972099a36c4ae31d8ec368ba832bf SHA-256: a62882eeb737ad5a534b6e643047e815326c014d3335c08e09380837763520a2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a collection of links, likely for SEO manipulation or to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7da77b951e---60519047541.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n7nl5lifocpd4mpjkhdmr49oq3/vanaxubiwetarepogazegawor.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/dosexuwopawibuxekukif.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e94a9ad20e776fb14b9b3ba7c5f828b2/69620376792.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d9da4548e---35785052600.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccac7b2971a---dabozoxonodibetipakovez.pdfIn PDF document text
    • http://tw-go.org/files/42283912727.pdfIn PDF document text
    • http://exima.kr/userData/board/file/56863488339.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/jadovesanibo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078f61c5cd30---virakuvig.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/lewemubazukago.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/98314515168.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/24373995478.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f79f74adf42d03f0ff1f92d34a7b3043/6331672148.pdfIn PDF document text
    • http://artospace.com/pics/file/vodixanad.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/befa5a9c2a81bd477299f7fca6744150/perogaku.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af883c229a9---55099256235.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6ee369d5a---batisolame.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/vuxotibebemoxosuraz.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/putatobotoxugage.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/vigetibajegopixunolurifan.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/musagomakemog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bhp+group+limited+share+pricePDF 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_off00015247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A5E 11012 bytes
SHA-256: 438ea9da6c21d3935bac1cd4ef71fb49a70ad60822662c54f63764458c5df3a0
font_02_sfnt_off000183c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183C3 18364 bytes
SHA-256: 63d7115d9f1d80c90523d6171b79b0e9ad92d331c9d69c4cf22341662f70a3cd

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